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  1. Fifth Wheel King Pin
  2. Lippert
  3. Lippert 1621HD
  4. 21000 lbs GTW
  5. Absorbs Road Shock and Reduces Chucking
  6. Upgraded Pin Box
Trailair Air Ride 5th Wheel Pin Box - Lippert 1621 & 1621HD - 21,000 lbs

Trailair Air Ride 5th Wheel Pin Box - Lippert 1621 & 1621HD - 21,000 lbs

Item # LC158778
Our Price: $1,349.06
You Save: $589.00
Fifth Wheel King Pin
This item qualifies for Free Truck Freight Shipping
Shipping Weight: 184 lbs
In Stock
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Product Expert Kathleen M

Is this right for you? Product Expert Kathleen M says:

Yes, if you:

  • Like having the "Cadillac" option - RVers with this pin box say it feels like their fiver is floating over the road
  • Often drive over very rough roads and want to save your truck and trailer (and yourself!) from getting beat up by all the bumps and dips

No, if you:

  • Have little space between the pin box and the nose of your trailer which can make monitoring and maintaining the pressure in the air bag a chore
  • Use a gooseneck adapter to tow your fifth wheel
  • Haul a trailer that weighs over 20,000 lbs
Enjoy smooth, stable towing with your fifth-wheel trailer by replacing your ordinary pin box with this air-ride-equipped model. An internal air bag and built-in strut absorb road shock so that you won't feel it. Replaces Lippert 1621 pin boxes. 1-800-940-8924 to order Lippert fifth wheel king pin part number LC158778 or order online at Free expert support on all Lippert products. Great prices and Fastest Shipping for Trailair Air Ride 5th Wheel Pin Box - Lippert 1621 & 1621HD - 21,000 lbs. Fifth Wheel King Pin reviews from real customers.
  • All Info
  • Reviews (122)
  • Q & A (0)
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  • Why etrailer?

Lippert Fifth Wheel King Pin - LC158778

  • Lippert 1621HD
  • 21000 lbs GTW
  • Absorbs Road Shock and Reduces Chucking
  • Upgraded Pin Box
  • Lippert
  • Fixed Turret

Enjoy smooth, stable towing with your fifth-wheel trailer by replacing your ordinary pin box with this air-ride-equipped model. An internal air bag and built-in strut absorb road shock so that you won't feel it. Replaces Lippert 1621 pin boxes.


  • Air ride pin box replaces standard pin box on your 5th-wheel trailer to cushion your ride, improve handling, and limit strain on truck and trailer
    • Minimizes chucking
    • Eliminates bounce and jarring
  • Internal air bag absorbs road shock
    • Scissor-like motion allows pin box to compress, compensating for jarring and bounce
    • Built-in shock ensures that pin box rebounds - keeps air bag from breaking down
  • Black powder coat provides rust resistance
  • Sturdy steel construction
  • King pin connects to any 5th-wheel trailer hitch
  • Bolt-on installation with no assembly required
  • Made in the USA


  • Designed to replace Lippert 1621 and 1621HD long-jaw 5th-wheel pin boxes
  • Weight capacity: 21,000 lbs
  • Length (from outside edge of mounting plate to center of king pin): 28-11/16"
  • 1-Year limited warranty

Note: Do not use the Trailair air ride pin box with any type of gooseneck adapter.

Getting there is half the fun, right? Not if you're being bumped, jerked, jammed, and pushed around from the chucking and road shock that occurs as you tow your fifth-wheel trailer or RV. And imagine the costly wear and tear on your trailer as it endures that rocky ride.

Put the fun back into your trip and ease the stress on your trailer by replacing your factory pin box with the Trailair air ride pin box. The internal air bag and built-in shock work together to cushion your ride, improve handling, and limit strain on both your truck and your trailer.

Air Bag Absorbs Road Shock

Lippert Trailair air ride pin box air bag and shock

Standard pin boxes without any type of shock absorption transfer road shock to your trailer, resulting in potential damage to the trailer and an overall bumpy ride. But the Trailair air ride pin box absorbs shock and cushions your ride as you pull your fifth-wheel trailer. When you encounter uneven terrain on your trip or hit a pothole on the highway, the Trailair pin box compresses vertically, similar to how a pair of scissor blades closes in on each other. This compression transfers the road shock and vibrations to the internal air bag, saving your fifth-wheel hitch, trailer, or tow vehicle frame from enduring a rocky ride.

A built-in strut, or shock, controls the Trailair's compression so that the internal air bag doesn't burst. The strut also causes the pin box to appropriately rebound without any bounce, and positions it to be ready for the next bump in the road.

Simple Setup and Installation

First, simply remove your existing Lippert 1621 or 1621HD pin box from your trailer. The Trailair uses the same bolts that held on your original pin box so no additional hardware is required for installation. Plus, the Trailair pin box comes out of the box ready to be put on your trailer, so no assembly is needed. Because the Trailair is quite heavy, you should put it on an elevated surface or have a friend help you support its weight during installation.

Lippert Trailair air ride pin box air intake valve and inflation indicator

The internal air bag should be inflated after the pin box has been mounted on your trailer. Using the air intake valve, inflate the air bag until the outer cylinder of the shock rises high enough to fully expose the yellow inflation indicator sticker.

158778 Lippert Components (LCI) Air Ride by Trail Air Fifth Wheel Kingpin Box for Long Jaw Lippert 1621 and 1621HD

Same as 35-946203 Ultra-Fab Air Ride Trail Air Kingpin Box

Replaces 171200

Customer Satisfaction Score:

Customer Reviews

Trailair Air Ride 5th Wheel Pin Box - Lippert 1621 & 1621HD - 21,000 lbs - LC158778

Average Customer Rating:  4.7 out of 5 stars   (122 Customer Reviews)

Enjoy smooth, stable towing with your fifth-wheel trailer by replacing your ordinary pin box with this air-ride-equipped model. An internal air bag and built-in strut absorb road shock so that you won't feel it. Replaces Lippert 1621 pin boxes.


I’ll start from the second I ordered this online. Confirmation email, then within days a shipping confirmation. When I ordered my shipping said 2 weeks out for delivery. I got the item in 9 days. The communication from the freight service was top notch. Unlike, some reviews the item was in great condition when it arrived. On a pallet in a box. No complaints. The driver even let me back up to his lift gate and help me slide the item into my truck for easier install. I had previously removed the factory hitch box prior to arrival so when the upgraded item arrived I was ready for install. Took about an hour to line everything up. Used a jack in the truck bed to help lift item where I needed it. I haven’t towed with it yet, that’ll be next week. But it looks beastly and like it’ll be a much more comfortable ride for me and my truck. Very happy so far, will leave an updated review after an out of state trip next weekend. etrailer was great. First item Ive ordered from you all but I’ll be back. Thank you!! Happy customer!!


With the help of my wife, I had the Flex Air pin box installed within 1.5 hours. Used a floor jack on top of my pickup tailgate.


Obviously a quality product made with quality materials. As you can see in the photo I placed the bottom bolts in the bottom hole. Problem is the bottom steel place is very close to the hardware so I had to have the bolt facing outward on the two bottom forward bolts. Don’t like torquing bolt heads but it worked. This is being very nit picky Torqued to 160 ft lbs.


Our fifth wheel experienced pin box cross frame cracking while on a trip. After having it properly repaired I decided to invest in the Trail-air pin box to alleviate the shock and harsh pounding from our lousy roads. I purchased from and installed it myself. Being only a 29 foot 5th wheel the tounge weight is low so after experimenting with pressures I run 40 psi in it and it flexes when hitting bumps or dips taking the stress off the trailer. Tows like a dream. Knowing what I know now I would have bought and installed it when I bought the 5th wheel and saved a repair during a trip. It is expensive but well worth it.


Added this pin box to improve ride and give my rv a smoother pull. The owners manual says you can use the orginal nuts and bolts, but felt getting new ones that are grade 8 was the best route for me.
The pin box had several deep scratches due to shipping so I mounted it and then painted over the scratches and resolved the problem.
The rebound shock didn't have the yellow arrow like the one in the pictures, does have an max inflation stamped in the shock but black on black doesn't help for proper inflation so I painted the arrow yellow, not great but it works.
Number one issue is no matter the inflation of the airbag I can't get it too the top of the arrow as required. I checked the PSI on the airbag and was at 135 PSI. I felt that was too high of air pressure and there's nothing in the manual or online to say how much air should be in an airbag so I went with 98 PSI to be safe.
As for the ride I feel it was an improvement over the previous pin box but to be honest my F450 has airbags as well, so was the improvement due to the pin box or because of the truck airbags. I'll go with both had factors with the ride. But the number 1 factor for me was the 21000 weight capacity. 4 out of 5 is the issue with inflation and what's correct.

Its been a year since last review, still havent had any issues with the pin box. Works well and provides a smooth ride under most conditions. If you run into rough patches on the road youll feel it and in my opinion there isnt anything made today that will eliminate that type of chucking. I also have airbags on my truck and it still happens. Now for the pin box 1. It works as advertised and improves the ride substantially. 2. The pin box is very well built and no issues period. 3. One issue is the air valve on top of the pin box which makes you get up into the truck bed to fill it with air. What would be a improvement would have a extension that attaches to the valve that would allow you to add air without having to get into the truck bed. To summarize, this pin box has been a great investment and if youre looking a replacement box, youll be happy you purchased this one.
David M - 03/04/2022


Stout, quality pin box. Quick shipping and great service. The final condition of the shipping container and some heavy scaring on the pin box left much to be desired from the freight carrier, but scuffs don't effect the functionality of the component.


Can’t believe what a difference it made. Pulling a 38’ Avalanche with a 2019 Ram dually and we now glide over formerly rough bridge approaches. I’m 76 and my brother-in-law is 69 and we installed it at our RV Park in about 20 minutes! That included removing the old one! Recommending it to all my friends!


The king pin has eliminated about 80% of the chucking. I pull 16k fiver. I am very happy with it. Related I always use etrailer for my parts purchase. One time I was stranded near Disneyland. I needed shackle. They had me triple check for correct part and rushed delivery. These guys are the real deal.


Took all the transfer of trailer hunting out of tow vehicle as you travel. Also give me more turning clearance on short bed F250.

Makes hook up a snap!
Dale H - 10/05/2021


I love this AirRide by Trail-air. It provides an incredibly smooth ride on the road. You can adjust the amount of air for your ride, the Schrader valve is right on top of the unit and easy to access. My Trail air installed easily on my Forest River Sandpiper 372LOK mid bunk, especially with help from my Dad. This Trailair solved a big problem for me. I needed an extra couple of inches space between my 2018 Ford Super Duty DRW and the coach. My truck came with the Ford factory-installed Reese 27K hitch and I needed more clearance to allow the tailgate to drop without touching the coach. The kingpin on the Trailair sits at least 2” forward of the factory kingpin and provided that desperately needed space. It really makes for smooth and quiet ride !
etrailer folks were very helpful. The first unit was damaged by the freight company and when I notified them, etrailer sent another unit quickly. I will buy from etrailer whenever I can..

I still love the ride it provides- always smooth. Wouldn’t use a standard kingpin again. The airbags lose air over time- it’s my only complaint. Not enough to effect performance on a week-long trip but it loses air. I tightened the fill valve. Will re-tape the valve again if needed.
Bernie C - 05/26/2020


You shipped the wrong kingpin!!! I had mega problems shipping it back to you, while your company held my payment, until you received the incorrect Kingpin back, all due to your company’s error!! That is why I will no longer do busywigh you!


Great replacement!


I noticed a much better ride inside my truck after installing my 5th wheel pin box.


Looks like a very good product, Easy installation only took an hour. Took it on a short test run On a very rough road It seemed to work well but we'll know more on the next upcoming trip. Packaging was inadequate could have used more Tie down straps , but no damage.etrailer is great to work with!!!


We ordered our Trailair Pin Box and it shipped and arrived earlier than expected. Great customer service and Excellent help with setup after installation.


This is the 2nd air ride hitch i've purchased. First one was on another 5th wheel and stupidly didn't keep it when I traded for the one I have now. They work great! It takes the shock out of the bumpy roads and keeps camper insides from re-arranging when traveling. Very happy with the hitch.


Had a great experience with etrailer ordered my air ride pin hitch and got a great part at a great price. Thanks everyone at etrailer I appreciate you all. Bryan


The package arrived with installation parts missing. It was very disappointing. etrailer was notified and sent another package, hopefully this time with all parts needed for installation.


Does help lessen impact of chucking on most roads. Unfortunately even this unit is no match for the s**t roads in central CA from Bakersfield to Modesto.


Before installing the airride , dish's shifted and draws opened. Now with easy installation and running 10 thousand miles none of the old problems appeared. Warning, always before leaving check air shock to be at the top of the arrow on shock.
Great product!


The trailair pin box I ordered and received looks be be everything I was told it would be. I have not bin able to road test the hitch yet as it's only early March and living in north east Minnesota, we still have about two feet of snow . I'm sure hoping it works as well as its supposed to.

I lovin the ride with this air ride pinbox. It works well for the ride on both truck and trailer, glad I decided to make the investment.
Dean s - 03/07/2021


Really made a positive improvement in towing my RV. The hitch absorbs the shocks from the trailer when towing and therefore the ride is much better in the tow vehicle. I also think it works the other way as well, RV is somewhat shielded from shocks the tow vehicle is experiencing. Am so impressed that I moved it over to our new RV. Well worth the time and cost to buy and install.


The ride is so much better. I also added air bags to my truck!


This is the second Trailair hitch I have purchased. Fast shipping and easy to install on our new DRV Fullhouse JX390. Much better than the Mor-Ryde hitch DRV uses. Now no bounce in the truck on rough roads.


Unbelievable difference from the standard king pin hitch! Made I-40 and I-70 a pleasure instead of a workout. Will definitely purchase again on the next trailer.

Show More Reviews

See what our Experts say about this Lippert Fifth Wheel King Pin

  • Identifying a Pin Box and Can a Trailair Pin Box be Used with a SuperGlide 5th Wheel Trailer Hitch
    First, to identify the pin box that you have on your trailer, look for a sticker on the pin box itself that lists the manufacturer and model number. With that information I can determine if there is an air ride pin box that will fit. If you cannot location the information then there are some measurements you can take, using the help article I have linked for you, and with those measurements I should be able to determine if there is a pin box replacement available. The air ride pin boxes...
    view full answer...
  • Correct Trailair Air Ride Pin Box to Replace Lippert Pin Box on a 2016 Heartland Sundance 5th Wheel
    Thanks for the information, but its not exactly what we need to determine which Lippert pin box you have. From what we know, it is most likely that you have a Lippert pin box 1621 because it is the most commonly used pin box for their Sundance 5th Wheels. I would encourage you to check your pin box again, sometimes there are multiple labels on them. The correct Trailair Air Ride's for the Lippert 1621 are: LC171200 for a 16K weight capacity LC155930 for an 18K weight capacity and # LC158778...
    view full answer...
  • Do TrailAir Pin Boxes Require Lowering Pressure During Storage
    You wouldn't need to remove any air from a Trailair like the part # LC158778 while storing it. Just be sure to check to make sure the pressure is correct when you go to tow again. The air system of this pin box is very heavy duty and lowering the pressure would not be needed. As with most air bag support devices you want to always have at least the minimum pressure rating in the bag at all times. So no lower than 20 psi.
    view full answer...
  • Why Would Flex Air Pin Box Cause Trailer to Sit Nose High
    Most likely the dealer installed the FlexAir in the lower set of bolts on your trailer which is causing the trailer to now sit too high. What you will need to do is unbolt the pin box and then install it in the higher bolt holes on the trailer. This will allow the trailer nose to lower which will improve your ride quality. You might have the dealer do the work since they are the ones who installed in the wrong holes. They other thing you can check is to make sure the bag isn't over-inflated....
    view full answer...
    Image 1 for
  • How to Determine What Pin Box is on a Trailer to Determine Which Cushioned Pin Box is Fits
    I can easily help you determine which pin box you have on your trailer. Since it is a Lippert I know we have a cushioned pin box that would work for it. But you will need to take a few measurements to know for sure. If you check out the link I attached you will see exactly how to measure your pin box to determine which you have and what cushioned pin box we offer that would fit it. The part # LC158778 would be the correct pin box to use if you have a Lippert 1621 pin box which is a very...
    view full answer...
  • Is Trailair Air Ride 5th Wheel Pin Box # LC158778 Compatible with a B&W Companion for a RAM Pucks
    Yes, the Trailair Air Ride 5th Wheel Pin Box # LC158778 is compatible with the B&W Companion 5th wheel trailer hitches including the models for the RAM OEM puck system. I have linked a video review of the pin box for you.
    view full answer...
  • What Air Pressure is Required for Trailair Air Ride 5th Wheel Pin Boxes?
    The Trailair Air Ride 5th Wheel Pin Box # LC158778 has an air pressure range between 20 and 120 psi. The amount of air pressure needed for your specific trailer will be indicated by a sticker located on the front shock and not by a specific psi. You will simply line up the lower part of the shock's outer tube with the top of the sticker. I've attached some photos to assist.
    view full answer...
    Image 1 for Image 2 for
  • TrailAir Flex Air Hitch for a Road Warrior 355 5th Wheel Toy Hauler and 2015 Ford F-250
    I recommend the Trailair Flex Air 21k, part # LC158778 for your Road Warrior 355. This hitch is designed to reduce bouncing, jarring and chucking of your ride and help reduce passenger fatigue. I reached out to Lippert and confirmed that the 1621 HD is compatible with all 1621 standard pin box replacements, so you'll be good to go with this new kit. I've included video review of the 21K unit including a test course demo so you can get a better idea of its performance.
    view full answer...
  • Should the Air Bag on a Trailair Air Ride Pin Box Be Filled Before or After Coupling to Tow vehicle
    When using a Trailair Air Ride Pin Box, like part # LC158778 that you referenced, you should inflate the air bag to the line on the shock once it has been connected to your 5th wheel hitch. I have attached a review video where you can see this process being done at the 3:47 mark.
    view full answer...
  • Trailair Air Ride Pin Box and Shipping of Product
    The Trailair Air Ride 5th Wheel Pin Box # LC158778 is a great option for replacing Lippert 1621 and 1621 HD pin boxes. It is rated for up to 21,000 lbs and utilizes both an air bag and shock to reduce chucking and jarring on your trailer. The air bag compresses to absorb road shock and then the shock on the front of the pin box helps to bring the weight back off the air bag allowing it to rebound to absorb the next shock. I've attached a video to assist. The price for the unit can be...
    view full answer...
  • Troubleshooting Triple Axle Trailer Bouncing When Being Pulled by 2017 Ford F-450
    Though I'm not 100 percent certain what you mean when you say "rolling" I can offer you some things to look for. If your fifth wheel is not being pulled as level as you can get it a lot of bouncing can ensue; it may also be a problem with the trailer's suspension. On a triple axle trailer, there are a lot of suspension components that can cause problems so you will need to thoroughly check to see if any part of your suspension is worn or otherwise needs replacing. Finally, upgrading your...
    view full answer...
  • Determining the Pin Box of Forest River Cardinal 3825fl Trailer
    Your Forest River Cardinal 3825fl trailer most likely has the Lippert 1621 pin box. You can confirm this by looking at the pin box as there should be a sticker or stamping of a number on the actual pin box. If you cannot find the number you can use the measurements of the bolt holes of the pin box to determine which one you have. I attached an FAQ on how to do this for you to check out also. If you have the 1621 I believe you have, the Trailair Air Ride 5th Wheel Pin Box - Lippert 1621...
    view full answer...
  • Recommended Trailair Air Ride Pin Box for 1621 Pin Box on Trailer
    The Trailair Air Ride 5th Wheel Pin Box # LC158778 referenced in your question is an upgraded pin box that is designed to replace the Lippert 1621 pin box like what you have. This will work great on your trailer and provide you with much improved handling and a nice, cushioned ride. This does indeed have a higher 21,000 pound weight capacity when compared to the standard pin box that it is replacing. With this in mind, you will still need to follow the trailer's original weight rating...
    view full answer...
  • Can Lippert Trail Air Pin Box Be Used with Pull Rite Fifth Wheel Hitch
    Yes, you can use the TrailAir pin box, # LC158778, with a Pullrite SuperGlide 5th wheel trailer hitch. You just need the correct capture plate for the TriGlide. We do not sell them but according to Pullrite you will need capture plate 331757.
    view full answer...
  • Can TrailAir Replacement Pin Box LC158778 Rated Lower than Existing Pin Box Still be Used
    I will be happy to clear this up for you. The capacity of the pin box will need to match or be higher than the gross trailer weight capacity. If the gross trailer weight capacity is 21,000 pounds or less then you can use Trail Air pin box # LC158778. If it is over 21,000 pounds the pin box will still fit but the capacity of the trailer will be limited to the capacity of the pin box and it is generally not recommend to use a pin box rated lower than the gross trailer weight. But as far as...
    view full answer...
  • Does Air Bag of Trailair Pin Box Need to Be Deflated When Parking Trailer
    You would not really damage the air bag if you left air in the bag, but just for good practice, I would deflate the bag if it's going to be parked for any length of time. This would keep any pressure off of the bag and fittings while it is in storage. For just a week I would leave the pressure in the bag and not think twice about it. It's incredibly rare that we ever hear about air bag issues with the Trailair and I am sure most people just leave it inflated so I would easily assume you'd...
    view full answer...
  • How Difficult to Install is the Lippert TrailAir Replacement Pin Box # LC158778
    The TrailAir 5th Wheel Pin Box is a bolt-on application. The torque specifications are included with the instructions. The pin box is HEAVY, but with few helpers you should be able to lift the pin box into place and get the bolts secured. Keep in mind that these units are pin box specific. You would need to get the manufacturer name and model number of the OE pin box, and choose a replacement that is compatible. The Ultra-Fab model you referenced is a replacement for a Lippert 1621.
    view full answer...
  • Air Bag TrailAir Pin Box has Shifted and is Tilted to One Side
    I am not sure how the air bag could even move like that. Make sure the shock is adjusted so that the outer sleeve is flush with the top of the arrow on the inner sleeve. You may need to deflate the bag and then re-add the air to get it back into position. there should also be a couple of bolts on top holding the air bag. make sure those are still there and tightened down. It is possible that excessive travel of the shock caused the bag to shift. You may need to temporarily remove the shock...
    view full answer...
  • Replacement Pin Box to Tow a 5th Wheel Trailer with 2002 Ford F-250 Short Bed
    On a short bed truck like your 2002 Ford F-250 you would either need to use a slider 5th wheel hitch or a Sidewinder replacement pin box to get the clearance needed to make tight turns without hitting the truck cab and trailer together. If you have the really short bed, less than 6 feet long, then a slider hitch would not work and you would have to use a Sidewinder. A Sidewinder is preferred either way because with it you will not have to worry about getting out of the truck to slide...
    view full answer...
  • Installation Of Replacement Air Spring On Trailair Air Ride Fifth Wheel Pin Box
    I called my contact at Lippert and although we do not have an installation video I was able to find the instructions that explain how to install a replacement air spring like part # LC156622. You would need to do the following per the instructions: The bag is fastened at the bottom first by inserting the carriage bolt in the key hole shape opening on the lower plate allowing the bolt head to slide in and be pulled forward securing the bag in place. Secure air bag with the air fill fitting...
    view full answer...
  • Best Air Pressure Setting On TrailAir Air Ride 5th Wheel King Pin
    Many factors can effect air pressure including the mechanics of each individual hitch, altitude and air temperature and the size of the air spring in diameter and height, the pin weight of the trailer. Usable air pressures can range from 20 to 120 psi. Therefore a specific air pressure is not recommended. We recommend you inflate the air bag to maintain a ride height.
    view full answer...
  • How Much Air Pressure Goes Into the Air Bag for Lippert TrailAir Pin Box L05
    Lippert has stated that usable air pressures for TrailAir pin boxes such as # LC158778 can range from 20 to 120 psi. There isn't a specific amount of pressure you have to use. Instead it is recommended to inflate the air bag to maintain a ride height. To determine the ride height Lippert includes a yellow sticker with arrows. The bottom edge of the upper collar on the shock will need to be flush with the tops of the arrows on that sticker.
    view full answer...
    Image 1 for
  • Cushioned Pin Box Recommendation for a Lippert 1621 Pin Box Replacement
    It sounds like you are asking which is better, a cushioned pin box or a cushioned fifth wheel hitch. Ideally you would want a fifth wheel hitch that has jaw design that provides great contact with the king pin of a cushioned pin box. The Trailair Air Ride 5th Wheel Pin Box # LC158778 would be a great option for if you have a Lipper 1621 pin box. I attached a review video for this product for you to check out as well.
    view full answer...
  • Recommended Trailair Replacement Pin Box for 2011 Heartland Big Horn 3610RE Trailer
    I checked the Heartland RV website for the pin box specs on your 2011 Big Horn 3610RE but this information was not available online. So, you'll just want to take note of the current pin box brand and part number to help identify a suitable Trailair cushioned pin box. The particular TrailAir part you referenced, part # LC158778, fits in place of Lippert 1621 or Ultra-Fab Tri-Glide L05 pin boxes. Simply click on the included link to select your pin box number to then see replacements.
    view full answer...

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