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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
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Our Price: $1,129.87
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Fifth Wheel King Pin
This item qualifies for Free Truck Freight Shipping
Shipping Weight: 184 lbs
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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 in your truck 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. 1-636-306-4830 to order Lippert fifth wheel king pin part number LC158778 or order online at Free expert support on all Lippert products. Guaranteed Lowest Price 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 (107)
  • Q & A (0)
  • Photos
  • Why etrailer?

Lippert Fifth Wheel King Pin - LC158778

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

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

Average Customer Rating:  4.7 out of 5 stars   (107 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!!


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


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


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.


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!!!


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!


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


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


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.


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.


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.


Every thing went Like you said it would .It was in very good shape with no damage .Going to put it on my RV and see how it works. Thank you

It was the best ride I every had .Wish I did it a long time ago
Jay - 02/17/2022


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


So far very happy! Thanks for all the great help Adam.


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!


What a big difference it has made. I was tired of the trampoline action but now it done so thank you for your timelyness in sending my order now I have to look at a Anderson hitch


Have the Lippert Components Trailair fifth wheel king pin installed on our 40 foot Big Country has made the difference in pulling the trailer down the road. I would recommend the King Pin if pulling a fifth wheel trailer. Now we don't even know it behind us. Great Product.


Really smoothed out the ride. Should have had one years ago.


Shipping was great and my camper pulls so much better. Great product!


Service was good as usual! Hope it works as well as expected. Haven’t used yet. Will re-rate later.

It really helps with the big dips and bridge approaches!! It doesnt do much for pickup ride on rough roads and road cracks. Helps with chucking. Would buy again.
Denny - 12/20/2021

Show More Reviews

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

  • How to Pick Out The Correct Cushioned Pin Box
    In order to pick out the correct cushioned pin box for your 2006 Alfa 30 foot Fifth Wheel trailer you will need to know which pin box model you have on your trailer. Most king pins will have the pinbox number listed on a sticker or it will be stamped on the king pin itself. If it's not there or worn out you will need to call the trailer manufacturer with the vin number of your trailer so they can provide you with that information. Check out the FAQ article I attached on cushioned pin boxes...
    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...
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  • 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...
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  • 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...
  • Troubleshooting Driver Landing Gear Leg That Lowers when Follower Leg Rises after Install
    One of two things are going, but most likely you installed your driver gear backwards. Since it is a driver gear there should be a drive shaft on both sides of the jack (one for the handle and one for the follower leg). If you installed it backwards it would operate in the opposite direction of the follower leg. What you would need to do is rotate the driver leg 180 degrees so that the leg raises and lowers in the same direction as the follower leg. Or you installed a driver gear from...
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  • Does Trailair Air Ride Replacement 5th Wheel Pin Box Use Same Bolt Holes as OEM Lippert 1621 Pin Box
    According to Lippert, their Trailair Air Ride Replacement Pin Box, part # LC158778 would use the same bolt holes and would occupy the same footprint as your existing 1621 pin box. If your old unit provided 6 inches of clearance, so will the # LC158778.
    view full answer...
  • Air Ride Pin Box to Replace a Lippert 1621 Pin Box
    If you have a Lippert 1621 pin box then all you will need is the correct replacement pin box that matches the bolt pattern. Keep in mind that some replacement pin boxes have additional holes because they can fit more than 1 pin box model. For a Lippert 1621 pin box rated at 21,000 pounds you can use # LC158778.
    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...
  • What is the Capacity of the Air Spring in the Lippert TrailAir King Pin
    I spoke to my contact at Lippert and she informed me that the TrailAir Air Ride 5th Wheel King Pin # LC158778 that you referenced has a 21,000 lb capacity air spring.
    view full answer...
  • 5th Wheel Trailer Overhang Hits Top of Truck Bed Going Up and Down Hills
    What you will want to do is raise the 5th wheel trailer hitch up higher and the pin box on the trailer lower. When parked on level ground and with the trailer level you should have at least 6 inches of clearance between the trailer overhang and the top of the bed side rails. Adding a different pin box like # LC158778 would provided an improved ride but will not give you any additional height. Making the adjustments on the hitch and trailer is the way to go.
    view full answer...
  • TrailAir Air Ride Pin Box Installation
    Due to the resistance provided by the airbag, it is not unusual for a TrailAir pinbox to be at a slight downward angle toward the front of the truck. When the TrailAir was installed, was there any play between the turret bolts and the holes in the mounting flange on the fifth wheel and the turret? If so, I would recommend loosening (but not removing) the bolts and readjusting the pin box to ensure that it is level to the trailer. Then re-torque the bolts. You will also want to ensure...
    view full answer...
  • Compatibility of TrailAir Air-Ride Replacement Pin Box with Pullrite Superglide 5th Wheel Hitch
    According to the folks at Pullrite, their Superglide 5th wheel hitches are compatible with the TrailAir Air Ride Pin boxes. The person I spoke with at Pullrite tells me that you will need a capture plate that is specific to the TrailAir Pin Box, which would be available from Pullrite. In order to bolt up properly, you will need to choose the correct replacement pin box. The TrailAir you mentioned is a compatible replacement for a Lippert 1621 pin box. If the manufacturer and model number...
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  • Which Sliding 5th Wheel Hitch or Sidewinder to Tow 36-Foot Cougar Trailer with Short Bed Silverado
    To select the correct cushioned pin box for your 2010 Cougar 36-foot Fifth Wheel trailer you will need to know which pin box model you have on your trailer. Most king pins will have the pinbox number listed on a sticker or it will be stamped on the king pin itself. If it is not there or worn off, call the trailer manufacturer with the vin number of your trailer so they can provide you with the pin box number. The Lippert King Pin you reviewed, part # LC158778, is a direct replacement...
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  • Which Replacement Trailair Pin Box for 2008 Keystone Challenge 35 5th Wheel
    In order to recommend the correct Trailair replacement pin box for your Keystone Challenge 5th wheel, I will need to know the manufacturer and model number of your OE pin box. This information should be listed on a plate or sticker affixed to the pin box. If you would care to reply with this information, I would be happy to make a recommendation. If you cannot find a model number or manufacturer, you can take some measurements of your OE pin box as shown in the FAQ article I have linked...
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  • Recommended Air Pressure on Lippert TrailAir Ride 5th Wheel King Pin
    According to Lippert there are many factors that can effect air pressure such as, the size of the air spring in diameter and height, the pin weight of the trailer, the mechanics of each individual hitch, altitude and air temperature. Lippert has stated that air pressures can range from 20 to 120 psi. Therefore a specific air pressure is not recommended. Instead a ride height is recommended to be maintained. To determine the ride height Lippert has indicated on the lower body of the shock...
    view full answer...
    Image 1 for
  • How Often Should Air be Added to the Ultra-Fab Trail Air Ride 5th Wheel King Pin
    You should only need to add or remove air from the TrailAir pin box # LC158778 to get the lower portion of the upper collar on the shock lined up with the arrows on the lower part of the shock when under load. Take a look at the picture I provided to get a visual of what I mean. Like any system that holds air (like tires for example) environmental factors can change the air pressure in the air bag. Be sure to that the shock is lined up properly as described above before towing. If the...
    view full answer...
    Image 1 for
  • What is the Air Pressure Setting On a TrailAir Air Ride 5th Wheel King Pin # LC158778
    According to Lippert there are many factors that can effect air pressure such as the size of the air spring in diameter and height, the pin weight of the trailer, the mechanics of each individual hitch, altitude and air temperature. Lippert has stated that usable air pressures can range from 20 to 120 psi. Therefore a specific air pressure is not recommended. Instead it is recommended to inflate the air bag to maintain a ride height. To determine the ride height Lippert has indicated...
    view full answer...
    Image 1 for
  • How to Determine Which Replacement Air Ride Pin Boxes will Fit a 5th Wheel Trailer
    Replacement pin boxes like # LC158778 fit specific trailer pin box models so the truck and 5th wheel hitch do not matter. You will need to look at the pin box currently on the trailer and get the manufacturer and model number off of it. Then you can look through the replacement fixed pin boxes we carry, see link, to determine if there is one that fits.
    view full answer...
  • What Trail-Air Pin Box Will Fit a 2009 Holiday Rambler Presidential 5th Wheel Trailer
    Trail Air pin boxes are designed to replace specific OEM pin boxes on trailers. To ensure we recommend the correct Trail Air pin box for your 2009 Holiday Rambler Presidential, we need the manufacturer and model number of the pin box that is currently on the trailer. This information can be found on the pin box on the trailer. Trailer manufacturers can use different pin boxes on the same models of trailers and unfortunately there is no cross reference for pin boxes and trailers available. The...
    view full answer...
  • Measurements of TrailAir 5th Wheel King Pin Box Rated for 21,000 Pounds # LC158778
    I went out to our warehouse and measured the TrailAir Ride 5th Wheel King Pin box # LC158778, and the distance from the center of the kingpin to the center of the first hole is 19-1/2 inches and the holes are 7-7/8 inches apart, center to center. This makes the second set of bolt holes 27-3/8 inches from the center of the king pin. I have confirmed with my technical contact at TrailAir and you will be using the existing hardware that is already on your Lippert 1621 pin box and this replacement...
    view full answer...
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