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  1. Fifth Wheel King Pin
  2. Curt
  3. Fabex 730
  4. RBW 7019
  5. 21000 lbs GTW
  6. Upgraded Pin Box
Trailair Air Ride 5th Wheel King Pin - Fabex 730, RBW 7019 - 21,000 lbs

Trailair Air Ride 5th Wheel King Pin - Fabex 730, RBW 7019 - 21,000 lbs

Item # UF35-946215
Our Price: $1,783.96
Fifth Wheel King Pin
Shipping Weight: 184 lbs
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Experience smooth, stable towing with your fifth-wheel trailer by replacing your ordinary pin box with an air-ride-equipped model. The scissoring action of the coupler allows the interior air bag to absorb road shock so that you won't feel it. 1-800-940-8924 to order Curt fifth wheel king pin part number UF35-946215 or order online at Free expert support on all Curt products. Great prices and Fastest Shipping for Trailair Air Ride 5th Wheel King Pin - Fabex 730, RBW 7019 - 21,000 lbs. Fifth Wheel King Pin reviews from real customers.
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Curt Fifth Wheel King Pin - UF35-946215

  • Fabex 730
  • RBW 7019
  • 21000 lbs GTW
  • Upgraded Pin Box
  • Curt
  • Absorbs Road Shock and Reduces Chucking
  • Fixed Turret

Experience smooth, stable towing with your fifth-wheel trailer by replacing your ordinary pin box with an air-ride-equipped model. The scissoring action of the coupler allows the interior air bag to absorb road shock so that you won't feel it.


  • Air ride pin box replaces standard pin box on your 5th-wheel trailer to enhance performance
    • Cushions and absorbs road shock
    • Improves handling and overall ride
    • Limits strain on truck and trailer frames
  • Scissor action allows pin box to compress, compensating for jarring and bounce
    • Internal air bag absorbs the road shock
    • Built-in spring ensures that pin box rebounds - keeps air bag from breaking down
  • Direct replacement for OEM pin box
  • King pin connects to any 5th-wheel trailer hitch
  • Sturdy steel construction


  • Designed to replace the following pin boxes:
    • Fabex 730
    • RBW 7019
  • Weight capacity: 21,000 lbs
  • 1-Year warranty


  • Not for use with any type of gooseneck adapter
  • Because of the size of this item, it ships via truck freight

Eliminate the bounce from your ride with the Trailair air ride coupler. The unique scissoring action of the pin box ensures that road shock is absorbed, preventing the harsh, rigid ride that you typically encounter while towing your fifth-wheel trailer. Not only does this improve your overall towing experience, but it also helps maintain a sound, well-functioning system. Less bounce and jarring means less stress on your truck, trailer and hitch.

Trailair Air Ride Coupler

How the Trailair Air Ride Works

When you encounter uneven terrain on your trip or hit a pothole on the highway, the Trailair pin box compresses, transferring the road shock to its internal air bag. A built-in air spring ensures that this compression occurs in a controlled fashion so that the air bag doesn't burst. It also causes the pin box to appropriately rebound, positioning it so that it's ready for the next bump in the road.

177696 Curt Trail Air Kingpin Box - M14

Replaces 35-946215 UltraFab Trail Air Kingpin Box - M14

Lippert Trail Air Kingpin Box - M14

Customer Reviews

Trailair Air Ride 5th Wheel King Pin - Fabex 730, RBW 7019 - 21,000 lbs - UF35-946215

Average Customer Rating:  5.0 out of 5 stars   (1 Customer Reviews)

Experience smooth, stable towing with your fifth-wheel trailer by replacing your ordinary pin box with an air-ride-equipped model. The scissoring action of the coupler allows the interior air bag to absorb road shock so that you won't feel it.


The pin box worked out very well. You still feel the bumps but almost no chucking. My wife likes to sleep in the truck with her head against the head rest, but she could not do that with the old pin box. The only thing that I had to do with the new pin box was drill out the holes because the old pin box had bigger bolts.


Freight co delivery estimated for Friday, arrived today. (Tuesday). Borrowed a tractor, dropped the old and lifted this monster into place. 12- 15/16 bolts (originally) 18 hole mount. Not sure if the height is correct for the bed, but will adjust it down if after the rubber bumper is inflated, if it doesn’t sit level. The bolt pattern was correct. better get help! From dropping the MFG lippert, to getting the thing lifted an bolts snugged up, about 45min. Will take a bit longer to attach the deadman switch and electrical box. Well crafted, definitely heavy. This should save my truck n RV from porpoising damage as I’m going over Bridges and bad roads.


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.


Have put around 10K miles on the hitch so far and it has performed well. An extra step in the pre-departure checklist to check the airbag pressure/ride height, but it is worth it as it greatly reduces the jarring from pot holes and abrupt changes in road surface. Installation was easy; perfect fit.


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: 05/08/2023

We're so anxious to try out our new Curt TrailAir.
Installation went smoothly, it looks great.
We can hardly wait to experience the ride!


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.


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!!


Exact fit replacement for cheap Keystone OEM part. Fit was so exact, I installed it by myself. Arrived earlier than expected. I hope this will reduce the chucking and smooth out the pull of a 16K RV trailer. I did have to purchase additional bolt sets from my local Home Depot (OEM was 12 sets, this is 18 sets 5/8-11 x 2in Grade 8 with flat and lock washers all torqued to 180 ft lbs).


I just completed a 2800 mile trip after installing the Trail Air Air Ride pin box on my Solitude 5th wheel. I was able to install it myself from the bed of my pickup using a hydraulic bottle jack to lift it into position.

I previously made the same trip with the factory installed MORryde Cushioned Pin Box and the Trail Air provides a greatly improved ride. With the MORryde, I encountered several sections of concrete highway that set up a front-to-back oscillation which persisted across many miles. I didn't have that issue with the Trail Air.

I didn't order the Flex Air model that also included the flexible block because I was concerned the added height of that pin box would have been a problem. However, after installing the non-flex Trail Air I've found that the other one would have also worked out if I lowered my truck hitch an inch or two.

Also worth noting, this pin box is four inches shorter than the 1621 MORryde it replaced. However with a long bed truck I have no clearance issues and can still lower the tailgate when hitched up.


I purchased this Lippert Air Ride hitch for my 40 foot Genesis Supreme trailer and wish I had bought it 2 years ago and installed it. What a difference is has made both in the trailer when towing as well as the difference in my truck while pulling it down the road. eTrailer had the best price and fast shipping. They as well helped me with verifying the right part number that works with my trailer. I purchase many parts and accessories from eTrailer and will continue to purchase from them in the future.


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.


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.


Smooths out the ride greatly, really pleased with so far. I removed the Air chuck and installed a tee with Gauge and air chuck makes it easy to monitor air pressure before traveling, one should note that these do bleed pressure down in few weeks that is pretty much normal for air bags of this type. I have a Dewalt cordless mini compressor and it works great to quickly & quietly pressurize before trip. I usually set my at 65 PSI


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.


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


I think that this is just what the doctor ordered. I have not installed it yet, but this looks very much like what I need for my trailer!


Good looking product. Mounted it on a Montana 40ft 5th wheel. It arrived 2 weeks ahead of schedule. It was easy to install. I did have to grind the corners of the trailer frame bracket as the jaw hinge wouldn’t allow the bolt holes to line up. Once the corners were ground, everything lined up perfectly. It only took my son and I to pick up the pin box and once the first bolt was in, it was simple and easy to do the rest. There are 3 things to complain about. 1. The position of the air valve sucks. Really hard to get at. 2. The mark on the shock for proper inflation is not marked well. Had to get on hands and knees with a flashlight to actually see it. It was suppose to be bright yellow, it’s black, same as the shock. My 3rd complaint would be the fact that I had to drill 3 holes into the pin box to reattach the brake safety cable and the electrical wire box. The biggest positive thing is, is how much of a difference it has made in the ride quality for not only with the trailer but the truck as well. Soooo much smoother than the original pin box. Would I buy another one? You better believe I would. Wondering why I didn’t buy it sooner. Won’t have another 5th wheel without it.


Have not did a road test yet but it’s installed.
Way heavier than factory. I have talked to many that have this and like it.
Helps reduce chucking back and forth movement. Nothing will be solve all if you are on a rough road you will feel it.
No hitch will eliminate.
Was fairly easy to install you will need help to lift. I used the tailgate on the truck and backed under and used blocking to get in place. I installed pretty much myself. My wife help some with aligning the bolts.


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.


We bought a new fifth wheel right after we bought the pen box and we were going to have it put on our new fifth wheel but the bolt holes didn’t match up. Therefore it was never used and has been sitting on our RV LOT ever since. We couldn’t rate because never used it but only way it would let us submit our comments


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..


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.


I'm pleased with the pin box. Put it on my 5th. wheel. The airbag gives us a better ride than any other pin box. Its a great product.


This is my second trailair pin box and I just love them it takes all of the bouncing out of the truck in the camper and makes it a smooth ride. Shipping was great and product came packaged as good as possible.

Show More Reviews

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

  • Measurements Of Trail Air Ride 5th Wheel King Pin # UF35-946215
    I went out to our warehouse and took some measurements for you of the Trailair Air Ride 5th Wheel King Pin - Fabex 730, RBW 7019 - 21,000 lbs # UF35-946215. Probably the most helpful measurements are: From the bottom of the king pin to the top of the air spring the measurement is 13 inches. From the bottom of the king pin to the top of the shock on the front is roughly 14-1/2 inches From the base where the hitch plate connects to the center of the first bolt hole is 9-1/2 inches. I've...
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  • Can a Welded-On Capture Plate be Cut Off of a TrailAir M14 Pin Box
    If you were to take a torch or grinder to the pin box you run the risk of damaging or weakening the skid plate. If you wanted to do that I would have it done by a professional welder to ensure that the skid plate is not damaged. Ideally though you would replace the TrailAir pin box with a new one, # UF35-946215.
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  • Should an Air Ride/Air Bag Pin Box Be Used when Towing 5th Wheel with Peterbilt Rig
    Typically, 5th wheel pin boxes with airbags are used when someone wants to improve the ride quality of the tow vehicle while pulling the trailer. You can certainly use a pin box with an air bag to help reduce the stress on your trailer while towing with your rig, but the stress reduction will likely be minimal. An air ride pin box will not provide a noticeable difference in ride quality with your rig. If you decide to replace your existing pin box with an air ride pin box, you will want...
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  • How To Locate Air Leak On Trailair Air Ride 5th Wheel King Pin
    I called my contact at Trailair and they told me that it can sometimes take 2 hours before a customer notices the air leaks in a system like part # UF35-946215. There are a couple things you can do to locate the problem. The first thing you can do is remove the air valve on the top of the unit and make sure it is clean and free of any dirt or corrosion. Then use some plumbers tape on the threads to make sure when it is installed it is air tight. If the system still leaks air, you can...
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  • Recommended Air Pressure in Air Bag of Trailair Air-Ride Pin Box
    The pressure in the airbag of the # UF35-946215 Trailair Pin Box can range from 20 to 120 psi depending on your situation. Once the pin box is installed, hitch the trailer to the tow vehicle on level ground. There is a sticker on the front of the shock absorber on the pin box. You should inflate the air bags until the bottom lip of the top shroud on the shock absorber is even with the arrows on the decal. TrailAir states keeping the ride level maintained at a certain level is the most...
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  • Trailair Air Ride 5th Wheel King Pin Pressure When Storing
    The air pressure on the Trailair Air Ride 5th Wheel King Pin - Fabex 730, RBW 7019 - 21,000lbs Item # UF35-946215 will gradually decrease over time, which is why the manufacturer states that you should check the pressure before each use. From what I've read from owners of this king pin the pressure typically holds for 2-3 weeks before needing to be filled up again. The environment you're in can affect this of course. So you can relieve the pressure if you want or leave it alone and it will...
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  • Troubleshooting Air Pressure Loss in my Trailair Pin Box
    The air bag in the Trailair Air Ride 5th Wheel King Pin part # UF35-946215 will seem to feel different when the camper is attached to the truck and can feel slightly softer after it is disconnected. It shouldn't loose any pressure. If you unhook the trailer and measure it at 30 psi it should be at 30 psi the next day as well +/- a lb. or so for temperature difference. If this is what is happening fill the bag to about 50 psi and spray with a soapy water solution to see where the leak...
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  • Recommended PSI For A Lippert Air Ride 5th Wheel Pin Box
    There isn't a set PSI for the Trailair Air Ride 5th Wheel King Pin - Fabex 730, RBW 7019 - 21,000lbs Item # UF35-946215. On the front of the pin box there is a shroud that wraps around the air shock absorber tube that will match right up to the tip of the arrows when the correct PSI is reached.
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  • King Pin To Front Bolt Hole Measurement For The Trailair Air Ride 5th Wheel King Pin # UF35-946215
    From the center of the first set of bolt holes to center of the king pin on the Trailair Air Ride 5th Wheel King Pin # UF35-946215 is approximately 14". I do want to note that the # UF35-946215 only fits the Fabex 730 and RBW 7019 bolt patterns. If you don't have one of these two patterns then you would need to find the appropriate match. If you don't know what your bolt pattern is and have a serial number on the front or side of your pin box then I can run the numbers to determine the...
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  • Install Instructions for Trailair Air Ride 5th Wheel King Pin Fabex 730, RBW 7019 21K UF35-946215
    Yes, I can help you out. Below are the installation instructions for Trailair Air Ride 5th Wheel King Pin - Fabex 730, RBW 7019 - 21,000 lbs Item # UF35-946215. Step 1) The Trailair pin box is installed in two main sections, upper body and lower jaw. Level trailer front to back. Measure old box from bottom of the kingpin plate to the ground. Add 9.5” to this measurement and that will be the height of the top flat area of the upper body to the ground. Remove old pin box. Care should be...
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  • What is Minimum Clearance Between Fifth Wheel Overhang and Bed Rails of Truck
    The minimum distance you want to have between the overhang of a fifth wheel trailer and the bedrails of a truck is going to be 6 inches. Some argue it's only 4 inches but 6 inches is really the safest minimum number to go with. You can adjust the height of the fifth wheel hitch head and the pin box in the frame of the trailer typically to allow you to get this clearance. But you also have to keep in mind that the trailer needs to be kept as level as possible too.
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  • Replacement Trail Air Pin Box for a Fabex PB730H 5th Wheel
    Yes, the Trailair air ride fifth wheel king pin # UF35-946215 will replace your current Fabex PB730H pin box. The Trailair will improve your handling and the maximum weight capacity is 21,000 pounds.
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  • How Much Air Pressure Should Trailair Cushioned Pin Box Have
    The Trailair Air Ride 5th Wheel Pin Box # UF35-946215 has an air pressure range between 20 and 120 psi and the amount of air you'll need to use will be determined after you hook your trailer up to your hitch. This 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
  • Can a Reese Revolution Pin Box be Replaced with Trailair Pin Box
    Can you get the pin box number off of the Revolution? You should see something like LIPP 1621 or Lippert 1621 or 1716. With that info we can determine which Trail Air you would need. Or if you see Fabex 730 or RBW 7019 the part # UF35-946215 you referenced would be a fit. It's interesting that you want to go from the Revolution to the Trailair. Typically the Revolution/Sidewinders are the most preferred pin box style and are what people switch to and not from.
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  • Availability of Trailair Tri-glide to Replace RBW 7019 Pin Box
    The Trail Air air ride pin box that would replace your RBW 7019 pin box on your fifth wheel would be part # UF35-946215. You can see current pricing on the product description page I've linked for you. Having a good 5th wheel hitch that utilizes a wrap around jaw to firmly hold the king pin would go a long way to reduce chucking. The standard Air Ride pin box will offer a noticeable improvement in ride quality over an OEM pin box. If you would like to upgrade your fifth wheel hitch, I...
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  • Is Tri-Glide Pin Box Available To Replace Fabex 730 Pin Box On Fifth Wheel Trailer
    The fifth wheel pin box we offer that is designed to replace the Fabex 730H you currently have is the Ultra-Fab Trailair Air Ride 5th Wheel King Pin, part # UF35-946215. This is a 21,000 lb capacity pin box that has an internal air bag to absorb road shock. We do not offer a Tri-Glide pin box that will work with the Fabex 730.
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  • 5th Airborne Premium Fifth Wheel Air Ride Coupler To Replace RBW 7026
    In my research I was unable to find 7026 as one of the RBW model pin boxes. It's possible the last number has worn off and what looks like a 6 is really an 8. You may want to check the number again to make sure it that isn't the case. If you find you have a 7028, which is a fairly common one, the replacement is part # UF35-946212. If you can't make out the last number for sure, you will need to measure the mounting holes to find the right replacement. I have attached a helpful article...
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  • Replacement Cushioned Pin Box Recommendation for Montana Fifth Wheel with Lippert 1716
    For the Lippert 1716 pin box you have on your Montana the only cushioned Lippert pin box we offer is the Trailair part # LC158777. We don't have a FlexAir at this time but this cushioned pin box will give you a much smoother ride quality that what you have currently.
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  • Recommended Air-Cushioned 5th Wheel Replacement Pin Box for Keystone Montana
    An aftermarket 5th wheel pin box that includes an air spring can improve your ride quality by taking some of the bumps out of your towing day. You can select a suitable cushioned pin box by noting the part number of your current pin box; usually this is found on the safety sticker on the left side of the box. Once you know your pin box number you can use the linked page to see the available models that will bolt up in its place. For example, if you have the popular Lippert 1621 then you'll...
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  • Availability of TrailAir Cushioned Pin Box to Replace Lippert Unit on 2007 Keystone Cougar 310SRX
    Compatible replacement 5th wheel pin boxes are determined based on the original item's part number. Lippert's most popular pin boxes are their 1621, 1621HD and 1716 models and these part numbers usually appear on the sticker located on the driver's side of the pin box. Once you know your pin box part number you can check for available replacement units like the TrailAir Flex Air # LC328492, for example, which bolts right up in place of a Lippert 1621. The linked page displays all such...
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  • Replacement Pin Box For A 2010 Carriage Carri-Lite 5th Wheel Trailer
    Based on the part number listed on your pin box (RPB72-730) you would have a Fabex 730 bolt pattern. At this time the only replacement option that we have available is the Trailair Air Ride 5th Wheel King Pin - Fabex 730 - 21,000lbs # UF35-946215. This upgraded pin box includes a shock and internal air spring in order to fine tune the ride quality of your trailer.
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  • Pin Box Replacement for RBW 7028 That Allows Additional Turning Clearance
    I can't find any record of an RBW 7026 pin box. I wonder if you have a 7028 instead and the number as you read it has been damaged making the 8 look like a 6. The 7028 is a very common pin box and the perfect solution for it (and you) would be to replace it with a Sidewinder part # RP61412. This will move the pivot point back 22 inches which will allow you to make sharp turns with your short bed truck. The Sidewinder pin boxes were designed for exactly what you are trying to do.
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  • Pin Box Replacement Recommendation for a Lippert 1116 to Reduce Chucking
    For a cushioned pin box to replace your Lippert 1116 pin box I would recommend the Trailair Glide part # LC155943 as it has been confirmed as replacement fit. Integrated steel rollers allow the bottom jaw to glide, reducing the push and pull that is typical in fifth-wheel towing. The internal air bag cuts down on bounce by absorbing road shock. The Trailair Tri-Glide works to defeat this troublesome occurrence by incorporating steel rods into the bottom of the pin box. These three rods...
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  • Solution for Chucking with 2016 Rockwood Forrest River 5th Wheel
    Thanks for the part number of your Reese Revolution Pin Box. I was able to do some digging on it and found that it is a specific Revolution made for your trailer that is narrower than most pin boxes at 10 inches (most are 12 or 12-1/2 inches). Because of that Lippert does not have any Trailair pin boxes that are a fit for it. We also got confirmation of this from Lippert. That being said, in nearly all cases of chucking the actual problem is the fifth wheel hitch. Upgrading to a fifth...
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