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  1. Fifth Wheel King Pin
  2. Lippert
  3. Lippert 0719
  4. 18000 lbs GTW
  5. Upgraded Pin Box
  6. Absorbs Road Shock and Reduces Chucking
Trailair Flex Air 5th Wheel Pin Box - Lippert 0719 - 18,000 lbs

Trailair Flex Air 5th Wheel Pin Box - Lippert 0719 - 18,000 lbs

Item # LC328484
Our Price: $1,367.96
You Save: $775.55
Fifth Wheel King Pin
Shipping Weight: 227 lbs
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Flex Air drastically reduces chucking, absorbs road shock, and minimizes bounce. The internal air bag and built-in strut work with the rubberized pivoting head to achieve a dramatically smoother ride. Replaces Lippert 0719 pin boxes. 1-800-940-8924 to order Lippert fifth wheel king pin part number LC328484 or order online at Free expert support on all Lippert products. Great prices and Fastest Shipping for Trailair Flex Air 5th Wheel Pin Box - Lippert 0719 - 18,000 lbs. Fifth Wheel King Pin reviews from real customers.
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Lippert Fifth Wheel King Pin - LC328484

  • Lippert 0719
  • 18000 lbs GTW
  • Upgraded Pin Box
  • Lippert
  • Absorbs Road Shock and Reduces Chucking
  • Fixed Turret

Flex Air drastically reduces chucking, absorbs road shock, and minimizes bounce. The internal air bag and built-in strut work with the rubberized pivoting head to achieve a dramatically smoother ride. Replaces Lippert 0719 pin boxes.


  • Air ride pin box with a pivoting head replaces standard pin box on your 5th-wheel trailer to cushion your ride, improve handling, and limit strain on truck and trailer
    • Drastically reduces chucking
    • Virtually 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
  • Pivoting head limits chucking by allowing controlled movement of the king pin within your hitch
  • Rubber compound built into the head absorbs road shock
    • Reduces wear and tear on trailer
  • 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 0719 5th-wheel pin box
  • Weight capacity: 18,000 lbs
  • 1-Year limited warranty


  • Do not use the Trailair Flex Air 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, road shock, and bounce 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 Flex Air 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. But what sets the Flex Air apart from other air ride pin boxes is the addition of a pivoting head. This head, along with its built-in rubber compound, provides additional cushion, absorbs road shock, and reduces chucking for a significantly improved ride.

Rubber Compound and Internal Air Bag Absorb Road Shock

Lippert Flex Air pin box has a rubberized pivoting head

A heavy-duty rubber compound is built into the head assembly of the Flex Air pin box. This rubber is the first defense against road shock. It helps to absorb the bumps and vibrations experienced when towing a fifth-wheel trailer over rough roads. 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. The shock-absorbing rubber inside the Flex Air takes the beating so there's less wear and tear on your trailer or RV and you get a smoother ride.

Lippert Flex Air pin box has a shock and air bag

Because the rubber may not be able to absorb all of the road shock that you experience, the Flex Air also implements air ride technology to virtually eliminate shock. When you encounter uneven terrain on your trip or hit a pothole on the highway, the Flex Air 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, and tow vehicle frame from enduring a rocky ride.

A built-in strut, or shock, controls the Flex Air'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.

Pivoting Head Reduces Chucking

Lippert Flex Air pin box has a pivoting head that reduces chucking

The pivoting head on Flex Air allows for controlled back and forth movement of the king pin to reduce the uncomfortable jarring known as chucking. Unlike a rigid pin box that has little give at the point where the trailer and the hitch are connected, the Flex Air can pivot slightly to compensate for those times that your trailer suddenly pushes or pulls on your tow vehicle. Because the pin box head - not the king pin itself - is moving, the chucking that often occurs when the king pin jerks around inside the hitch is significantly reduced.

Simple Setup and Installation

First, simply remove your existing Lippert 0719 pin box from your trailer. The Flex Air uses the same bolts that held on your original pin box so no additional hardware is required for installation. Plus, the Flex Air pin box comes out of the box ready to be put on your trailer, so no assembly is needed. Because the Flex Air is quite heavy, you should put it on an elevated surface or have a friend help you support its weight during installation.

The internal air bag should be inflated after the Flex Air 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.

328484 Lippert Components (LCI) Flexair by Trail Air Fifth Wheel Kingpin Box for Lippert 0719

Customer Satisfaction Score:

Customer Reviews

Trailair Flex Air 5th Wheel Pin Box - Lippert 0719 - 18,000 lbs - LC328484

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

Flex Air drastically reduces chucking, absorbs road shock, and minimizes bounce. The internal air bag and built-in strut work with the rubberized pivoting head to achieve a dramatically smoother ride. Replaces Lippert 0719 pin boxes.


I haven't tested it out yet, but I can't wait! I have friends that just marvel about this pin box.

Richard R.


No problems, I dont know if the chucking is improved as I have nothing to compare to. I went off a recommendation of a friend.


etrailer did their part very well, great service, but the delivering carrier beat the crap out of my pin box. TForce trucking did a poor job handling the freight.


Replaced Rhino with this unit on my Cedar Creek 311RL. It was straight forward and simple, but not easy for this old man to do it solo. Used the tailgate as my shop. Stuck the back up in the air and drove back to insert into the bracket. I then used the levelor on the trailer to line up 2 of the holes to insert the first bolts. I used a car jack near the pin to raise the 230 pound box into line up position to insert the other 8 bolts. Torqued it down and aired it up, then test drove it. Rides like a dream. Much softer on those in the tow vehicle and I assume on the fifth wheel itself.
Service from etrailer was good. The advice and recommendations for my specific rig was a little off. But I was able to do research myself. Shipping was timely. Over all another successful etrailer transaction. Thanks to everyone.


This Curt flex air 5 th wheel pin box was probably the best investment that I’ve made in pulling my fifth wheel. It takes approx. 75% to 85% of the rebound bounce out of hitting irregularities in the roadways, of which there are many. I’ve pulled a 36’ couger and now a 41’ reflection. It makes pulling a trailer, almost, pleasant.


This is the best money I have spent on my camper hands down. My hitch weight is a bit over 3200 lbs. I use a PullRite Super Lite hitch, photo attached. Once locked on the king pin, four bolts are set from the adapter plate against the king pin plate. The plate on the Flex Air is twice as thick as the original pin box and I have way more confidence in a solid set of these four bolts. I was blown away by how this hitch absorbed road shock. I will never have another 5th wheel without this set up.


We didn't like the way our trailer rode with this pin box. Made one trip of about 6000 miles, and when we got home removed it, and put the factory hitch back on. I called etrailer to tell them I didn't like the hitch, and was there anything they could do, and the rep said they couldn't help me at all. I'm not satisfied with the hitch, or etrailer at all.


4 stars as I have just recently installed this although I received it over a year ago.
I just put 750 miles on it and experienced almost every PAVED road condition imaginable and it worked great. I can't imagine what that would have been like with the stock pin box.

4 stars because I still need to see how it performs off road and I am just a few days into using it on a trip covering OR, ID, MT and WY so I still have my personal evaluation to complete and need more drive time to see if anything fails on it.

Installation was a breeze but it's a heavy hitch so caution is advised.


So far it's performed great. Really reduces the bucking and normal bumps. My only issue is the kingpin angles DOWN too much for me and not sure how to correct it. the plate where to pin is, is not level when hitching up which has caused gouges in my 5th wheel plate.


Install went pretty smooth. Did it from the bed of the truck, using a motorcycle jack in front and a small hydraulic in back. Make sure your torque wrench can dial to 160 ftlbs. I will update after I tow it!!!


Best thing since slice bread,the way the roads are not repaired and full of pot holes and patches this has smooth out the ride, A must to have on your 5th wheel,,


First, about etrailer. As always, their service was outstanding. They honored their low price guarantee without question and shipping was fast.
I upgraded from a Trailair Air Ride pin box with a fixed turret. That pin box helped with bouncing and jarring, but I still got a lot of "chucking". This FlexAir pin box solved that problem as well. Installation was a breeze, although you must make sure you have enough adjustment on your trailer to mount this pin box higher up than your existing pin box. I had to mount it at the very highest set of holes on my trailer. Lipperts web site has specs on this pin box and installation instructions, including measurements and torque specs. With the help of a friend and using the bed of my pickup truck, we unbolted the old one and bolted the new one in. Took about an hour and that was not hurrying.
I took the trailer out this past weekend with the new pin box and hit some pretty bad roads. Wow! What a difference this pin box makes. I can only describe the ride one way. Smooooooth. I am very pleased with both etrailer and this product. It's pricey, but to me, pulling a large fifth wheel trailer, it's worth every penny. Highly recommended.


Have not had a chance to take it for a road test yet. But it fit well, was easy to mount, the issue I ran into was getting the pin height. As my truck is 4x4, and the B&W hitch is as low as it can go, I still needed another 2 inches to get the pin box high enough, could not raise pin box any higher, and with the 5th wheel already at 13'4" did not want to lift the trailer, so ended up lowering the truck 2 inches to get everything back level again. But will find out next week how it works as we start out on a close to 12,000 mile trip to the west coast and back across through canada and back to florida.


Installed on my 2019 Grand Design Momentum 351 and it fit perfect. Shipper came on time and helped me slide it on to my tailgate, it came on a small pallet. I backed it up to the camper and used a car jack to lift up the aft end. Once I got the lower holes on either side aligned I installed bolts loosely. Then I jacked up the forward side and installed bolts once they lined up. Installed very easy by myself. I did purchase grade 8 replacement bolts from [farm store]. Original bolts were 1 1/2" I put in 2" because the metal is thicker on the new pin box and I wanted threads to come through the nuts. I installed the new bolts with the nut on the outside to make it easier to torque the bolts to the required xxx lbs. I haven't got to try out how it helps out for chucking yet. I will add to this review later to tell how it went.


I have used my Flex Air for over one year and put around 3000 miles on it. I purchased this for one reason to reduce bucking when I it bumps in the road. I can safely say that it has virtually eliminated the bucking. It has also made the ride a lot smoother. I would highly recommend the Flex air. I did my own install of this product by my self.

My rig
2018 Toyota Tundra with a Husky 16 KW Hitch
2017 KZ Durango 30 ft.


Reflection 320MKS
Dealing with etrailer
was very easy. Starting with getting the correct information on which pin box would be suitable for our trailer.
The unit arrived in 10 days from ordering it. Which was less than the estimated timeframe when placing the order.

The only down side, on inspection when arrived, the air bag valve was damaged in transit. A quick email with photos, a call to etrailer & they have a replacement part ready to dispatch.
Great customer service & i would definitely recommend them.


Believe the hype! This kingpin is the “kingpin of kingpins”. I went from my straight 1621 to this. The difference was astounding. It was like going from being on the SS Minnow on rough seas to the USS Nimitz on a calm bay. Very little chucking. True night and day difference. Yes, it is a little pricey, but if you consider the potential outlay of cash to the incurred maintenance of wear and tear from travel to BOTH the tow vehicle and trailer-I felt it was worth the investment. If you’re looking into upgrading-do it. It’s worth it!


I will be on the third flexair pin box when it gets here on the 21st of November 2016. The problem iIm having is with the lower roto flex portion. The rubber block shifts and I have talked to others with the same problem. Lippert has been great about the replacement, But the the hassle of replacing this three times in one year is not worth it.


Awesome price! Being installed on a Grand Design 375RES. Shipment went great this is a heavy unit, arrived banded on pallets in excellent condition. Installation was simple and as instructions stated. Waiting for the next road trip to be able to test effectiveness. Always been a pleasure dealing with E-Trailer.


Easy install. Took 2 people due to the weight of the Flex Air pin box. The Lippert 1621 is pretty light comparatively. We placed the pallets the flex air was shipped on (Estes Freight) in the back of the Dually, then labored the Flex Air on top of the pallets. Backed the truck under the 5th wheel and were able to start getting bolts through with small adjustments. Too heavy to lift and put bolts through. Tools used: 1/2 in High Torque Dewalt Impact, 15/16 impact socket, 15/16 wrench, 50-250 torque wrench, impact driver to get the breakaway removed and remount. The grade 5 bolts I have required xxx ft lbs torque. Completed install in 45 minutes.


Was a little worried initially as to whether or not5his was actually a Lippert part-when it arrived the box was INTACT! That’s NEVER happen, regardless of who the sales point was originally.
All kidding aside, you folks at eTrailer have always taken care of us with finding the right item for the job, and this pin box is how you do so consistently with the additional bonus of saving time (arrived a week earlier than expected) and money ($225 less than the nearest competitor and included shilling!). Thank you!


Smoothest ride that I've ever had with a fifth wheel trailer


I'm sorry I can't give a 5 star rating for this order. As always etrailer service was 5 star. But, unfortunately the pin box was received with some damage. Originally I thought the damage was limited to cosmetic only. There were some gashes in the metal and deep scratches in the paint. However, after about 5 months of use I noticed a bolt on the jaw that appeared to be misaligned. Upon inspection it was obvious that the bold was striped. It must have taken a direct hit when dropped during shipping.

The good news is LCI did replace the pin box for me under warranty. However, I had to pay for the installation which was understandable.

In retrospect I should not have accepted the shipment. I'm not sure where the packaging was done but this would have been avoided if this 230 lb product was packaged appropriately.


I bought the Flex Air to replace the standard Lippert pin box on our Cedar Creek fifth wheel that weighs 12K lbs. Just looking for something to smooth out the ride and the Flex Air seemed to have good reviews and recommendations.

I went to the Lippert website to download the installation instructions because I couldn't get the link on the etrailer website to work. The instructions will give you the torque values required for installation and the air pressure for the inflatable airbag on the hitch.

Installation was straight forward, but you better have a plan because this thing is heavy (300 lbs) and it will take some manpower to move around and install.


I have put about 4,000 miles on my camper since I installed this flex air pin box and it doesn’t disappoint. No more chucking or teeth rattling on those bumpy roads, you sometimes forget you’re cruising with a 40 foot trailer. Don’t think twice about it you won’t be disappointed.


The reason I purchased the pin box is I needed some extra distance between my truck bed and 5th wheel. It did the trick, I got an extra 5" (had 4"). But the ride is amazing! Very pleased with towing, I almost can't tell I'm pulling a 44' toy hauler cause it's so smooth. My ordering experience was top notch, I will definitely purchase again from

Show More Reviews

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

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  • Which Flex Air Pin Box Fits Rockwood Signature Ultra Lite
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