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

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

Item # LC158778
Retail:$1,957.22
Our Price: $1,299.78
You Save: $657.44
Fifth Wheel King Pin
Shipping Weight: 184 lbs
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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 etrailer.com. Free expert support on all Lippert products. Great prices and Fastest Shipping for Curt Air Ride 5th Wheel Pin Box - Lippert 1621 & 1621HD - 21,000 lbs. Fifth Wheel King Pin reviews from real customers.
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  • Reviews (141)
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Lippert Fifth Wheel King Pin - LC158778

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


Features:

  • 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


Specs:

  • 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 Curt 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 Curt 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 Curt 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 Curt air ride 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 Curt air ride pin box'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 Curt uses the same bolts that held on your original pin box so no additional hardware is required for installation. Plus, the Curt pin box comes out of the box ready to be put on your trailer, so no assembly is needed. Because the Curt is quite heavy, you should put it on an elevated surface or have a friend help you support its weight during installation.


Lippert Curt 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

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

Average Customer Rating:  4.7 out of 5 stars   (141 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.

by:

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 etrailer.com 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.

Charles F.

10/26/2023

Still very pleased with my purchase and reassurance it gives me against future problems.



by:

the fit was perfert. as you can see from the pictures is attached, i drilled a hole in the top to drain water that collects. i fabercated a cover to fit over the opening.



by:

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!!



by:

Best upgrade to the 5th wheel you can do. Our first cross country trip and I-40 beat the snot out of us on all the bridge transitions with the stock pin box. Immediately ordered this unit and now it’s like the trailer is floating behind us. I run 65 psi in the airbag. Solid unit and easy installation.



by:

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.



by:

This is an outstanding pin box. It makes our trailer pull really nice. I know everyone says "I didn't even know I was towing anything" which is usually not the case, however with this, it really was like nothing was/is behind me. I highly recommend this product.



by:

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.



by:

Easy install. I dropped it down one hole Vs. the factory one and still has all 10 bolts without drilling any holes.



by:

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.



by:

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..

Bernie C.

5/26/2020

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.



by:

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.

David M.

3/4/2022

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.



by:

Excellent company to deal with. Top notch product



by:

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.



by:

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!



by:

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!



by:

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!!!



by:

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



by:

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.



by:

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.



by:

Smooths out the porpoising when traveling over rough roads and at uneven bridge abuttments.



by:

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.



by:

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.

Dean S.

3/7/2021

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.



by:

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.



by:

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



by:

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.


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

  • Is Curt Trailair Pin Box Compatible with Anderson Ultimate Hitch
    Yes, the Andersen Ultimate hitch you have is compatible with the Curt Trailair pin box part # LC158778 that you referenced.
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  • Weight of Trailair Air Ride 5th Wheel Pin Box
    The shipping weight of the Trailair Air Ride 5th Wheel Pin Box - Lippert 1621 & 1621HD, # LC158778 is 184 Lbs. That includes packaging.
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  • Is the TrailAir Air Ride Pin Box Compatible with a Pullrite 2400 Superlite Hitch
    Yes. King pins like the ones on the Trailair Air Ride 5th Wheel Pin Box - Lippert 1621 & 1621HD - 21,000 lbs # LC158778 are a standard part and all the same size, so the adapter that comes with your Pullrite 2400 hitch will fit on this without problems. The Trailair Air Ride # LC158778 is a great solution to take some of the bounce out of your ride and make your towing experience much smoother. I've linked a review video and test course video for you to check out.
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  • Could 18k Rota Flex Pin Box be Replaced with 21k Trail air
    If your trailer has a Lippert 1621 pin box style Rota Flex then yes the TrailAir 21k part # LC158778 that you referenced will work well as a replacement. On the pin box you should see Lippert followed by a 4 digit number which will most likely be 1621 since that is a super common pin box. Also if your pin box has the part number 328330 that indicates too that it's a 1621 pin box.
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  • Will The Trailair Air Ride 5th Wheel Pin Box Fit On A Andersen Ultimate 5th Wheel Hitch
    I reached out to Andersen, and they confirmed The Trailair Air Ride 5th Wheel Pin Box # LC158778 will in fact fit with your Andersen Ultimate Hitch.
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  • Can Trailair Pin Box be Used with Andersen Ultimate Fifth Wheel to Gooseneck Adapter
    I have checked with my contacts at Andersen, and the Andersen Ultimate Gooseneck to 5th Wheel Connection Adapter is compatible with the traditional trail-air pin boxes. My contact further explained that this adapter is not compatible with Trail-Air's Rota-Flex pin box. This is due to the forward and rearward movement in this pin box. If you have a traditional trail-air pin box that then this adapter will work great for you. I would need to know what pin box you currently have to be...
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  • Can Air Pressure be Left in Air Bag of Trailair Pin Box when Stored
    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. 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. If you plan on storing the trailer, I also recommend either covering the pin box to protect it and the bag from the sun or applying something like Armor All to the air bag to protect the rubber.
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  • Will Item # LC158778 Provide Extra Clearance On A 2019 Ford F-250 With A 4.5" Lift
    The Trailair Air Ride 5th Wheel Pin Box Item # LC158778 will work on your 2021 GD MOMENTUM 320G as long as your current pin box is a 1621 or 1621HD pin box. If its not, then the bolt pattern may not line up. I am unable to determine what pin box you have by the manufacturer of the camper. The concern I have is your 2019 Ford F-250 being lifted 4.5 inches. You want around 6" of clearance between the top of the bed rails and the bottom side of the nose of the camper. Item # LC158778 is...
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  • 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...
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  • Do Lippert Pin Boxes Have A Certain Pin Weight Capacity
    The Trailair Air Ride 5th Wheel Pin Box does not have a pin weight capacity figure according to Lippert. Typically a trailers pin weight is 20% of the total weight of the trailer. That means your trailer should weight around 15,500 lbs. Trailair Air Ride 5th Wheel Pin Box - Lippert 1621 & 1621HD part # LC158778 is rated for trailers that weigh up to 21,000 lbs so this pin box is properly rated for your trailer if you are replacing a Lippert 1621 and 1621HD long-jaw 5th-wheel pin boxes....
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  • 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.
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    Image 1 for Image 2 for
  • Can Trailair Pin Box be Used with Pullrite Capture Plate
    Trailair pin boxes like the # LC158778 can be used with Pullrite pin boxes if you use the correct capture plate. We do not currently carry PullRite products but according to my research the correct capture plate is the part 331758, which you can obtain from PullRite directly.
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  • Inflation of Trailair Air Ride Fifth Wheel Pin Box
    The Trailair Air Ride Fifth Wheel Trailer Pin Box # LC158778 has an air valve on the top of it. It should be inflated until you can see the yellow sticker on the outer cylinder. It has an arrow on the sticker showing where to inflate to. There really isn't a time to deflate the air bag, unless you'd like to for storage when not using the trailer. I've linked a video that shows the pin box being installed. When you get to around the 4:10 mark you'll see it being inflated.
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  • How To Determine The Correct PSI For A Trailair Air Ride Pin Box For A Smoother Ride
    Lippert removed the old sticker gauge from their Trailair Air Ride pin boxes # LC158778 because they were receiving a lot of complaints about it not matching up with the smoothest ride depending on the trailer. Since the pressure needed for the air bag is dependent on the pin weight, and that can vastly change depending on the trailer and what you have loaded in it, there isn't really a good catch all psi setting. Lippert's new recommendation is to keep the air bag between 20-120psi and...
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  • Does Air Bag of Trailair Pin Box LC158778 Inflate With Trailer Connected or Disconnected
    You will want to have the truck connected to the trailer when inflating the air bag of the Trailair part # LC158778 so that you can determine what the proper pressure will be to get it sitting where it needs to be. If you are asking about whether or not the bag itself prefers to be inflated with the load of the trailer on it or not that would not matter. The bag will inflate just fine with a trailer connected. The load would not affect anything or change the pressure.
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  • How to Determine if the Trailair Air Ride 5th Wheel Pin Box Fits a 2021 Forest River Sabre
    To determine if the Trailair Air Ride 5th Wheel Pin Box # LC158778 will fit your 2021 Forest River Sabre camper you will need to figure out what pin box you have. This is not information we have from the campers information. I have included a help article that goes over how to figure out what pin box you have. If you determine that you have a Lippert 1621 or 1621HD pin box then the Trailair Air Ride 5th Wheel Pin Box # LC158778 will fit. If you find that you have a different pin box you...
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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...
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  • How To Determine What Pin Box Is Installed On 2004 Keystone Laredo Fifth Wheel Trailer
    In order to find the correct pin box replacement for your 2004 Keystone Laredo 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 you still cannot find it you will need to call the trailer manufacturer with the vin number so they can provide you with the pin box information. I have attached a link that shows how you can measure your pin...
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  • 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.
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    Image 1 for
  • 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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  • Availability of a Trailair Air Ride Pin Box to Replace a MorRyde Pin Box Model 1621SHD
    My contact at Lippert told me that you can replace your current MorRyde pin box with a Trailair pin box. The pin box replacement is # LC158778 Trailair Air Ride Pin Box. This pin box is rated at 21K and is the replacement for the Lippert long jaw 1621 pin box and will replace the MorRyde pin box.
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  • Is It Normal For Replacement Pin Box To Measure Narrower Than Brackets on Trailer
    The 11-13/16" wide measurement on the Trailair Air Ride 5th Wheel Pin Box part # LC158778 that replaces the 1621 HD pin box is standard. I was able to confirm this with the engineers at Lippert. Once you torque the bolts down the brackets on the trailer will pull in and that is completely normal. It will not put stress on the frame, replacement pin boxes are made to be a bit narrower then your brackets on the trailer so they can easily fit into place while installing. Otherwise you would...
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  • Trailair Pin Box for Lippert 1621 that is Compatible with Andersen Ultimate Connection
    You'd want the Trailair pin box part # LC158778 that you referenced which is the correct fit for a Lippert 1621 pin box and is perfectly compatible with your Andersen Ultimate fifth wheel hitch as well.
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  • Solution for Setting Trailair Pin Box Air Pressure without Sticker
    If the yellow sticker isn't present on the shock of your Trailair Air Ride Pin Box like # LC158778 there are still a couple of methods you can use to ensure the bag is properly filled. When hooked up to your truck, the air bag just needs to be filled with 80-90 psi of pressure. As long as you are within this range you're good to go. Otherwise our contact at Lippert also said that if you look really closely at the shock, there should be an embossed line that can be used instead of the...
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