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

Curt Flex Air 5th Wheel Pin Box - Lippert Rhino - 21,000 lbs

Item # LC65VR
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Retail:$1,700.95
Our Price: $1,603.55
You Save: $97.40
Fifth Wheel King Pin
This item qualifies for Free Truck Freight Shipping
Shipping Weight: 181 lbs
Quantity: 
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Product Expert Kathleen M

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

Yes, if you:

  • Have heard of the AirRide and want that premium experience but with some added support to dampen any chucking
  • 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:

  • Get annoyed by having one more thing to check before hitting the road - the air pressure on this needs to be monitored and adjusted
  • Have a gooseneck adapter in your truck to tow your fifth wheel
  • Have a trailer that weighs over 20,000 lbs
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 Rhino pin boxes. 1-800-940-8924 to order CURT fifth wheel king pin part number LC65VR or order online at etrailer.com. Free expert support on all CURT products. Guaranteed Lowest Price and Fastest Shipping for Curt Flex Air 5th Wheel Pin Box - Lippert Rhino - 21,000 lbs. Fifth Wheel King Pin reviews from real customers.
  • All Info
  • Reviews (110)
  • Q & A (0)
  • Photos
  • Why etrailer?

CURT Fifth Wheel King Pin - LC65VR

  • Lippert Rhino
  • 21000 lbs GTW
  • Absorbs Road Shock and Reduces Chucking
  • CURT
  • Upgraded Pin Box
  • 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 Rhino pin boxes.


Features:

  • 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


Specs:

  • Designed to replace Lippert Rhino 5th-wheel pin box
  • Weight capacity: 21,000 lbs
  • 1-Year limited warranty


Notes:

  • Do not use the Curt 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 Curt 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

Curt 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.


Curt 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

Curt 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 Rhino 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.



807711 Curt Flexair Fifth Wheel Kingpin Box for Lippert Rhino - 21,000 lbs

Replaces 807711 Lippert Components (LCI) Flexair by Trail Air Fifth Wheel Kingpin Box for Lippert Rhino - 21,000 lbs






Customer Reviews

Curt Flex Air 5th Wheel Pin Box - Lippert Rhino - 21,000 lbs - LC65VR

Average Customer Rating:  4.6 out of 5 stars   (110 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 Rhino pin boxes.

by:

The hitch arrived on time and in good shape however there was no owners manual or warranty paperwork with it. Called to get torque values.




by:

Hitch has been wonderful and provides a great ride.




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by:

Review from a similar Trailair Flex in Fifth Wheel King Pin


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 150 ft lbs torque. Completed install in 45 minutes.




by:

Review from a similar Trailair Flex in Fifth Wheel King Pin


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.


Comments
Since this original post I have gone back to a regular style 5th wheel hitch new truck with factory puck system but the Flex Air is still doing its thing and I will never pull a trailer without it unless something better is invented.
Russ - 02/11/2021


by:

Review from a similar Trailair Flex in Fifth Wheel King Pin


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.


Comments
Really glad we switched out pin boxes, the Flex Air was a great choice and definitely smoothed out the ride.
Joel - 02/13/2021
Comments
Really glad we switched out pin boxes, the Flex Air was a great choice and definitely smoothed out the ride.
Joel - 02/13/2021


by:

Review from a similar Trailair Flex in Fifth Wheel King Pin


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 160 ft 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.




by:

Review from a similar Trailair Flex in Fifth Wheel King Pin


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.


Comments
I just finished a 3,000 mile trip from Oregon to South Dakota. The hitch works like a dream. Very few road issues are transferred to my truck from the trailer. This is a great hitch. Totally satisfied with this purchase.If anything I wish they made an offset pin box so that I could adjust it to make my trailer ride correctly, as it is with my 4x4 it runs a tad nose high.
Arman K - 10/08/2019



by:

Review from a similar Trailair Flex in Fifth Wheel King Pin


1st off, Tammie from etrailer.com follows up with a 1year review of this product! Great way to stay ahead of the game. GO ETRAILER!!. And oh by the way.....The new pin box smoothed out the ride and handling nicely. Definitely happy I bought it.




by:

Review from a similar Trailair Flex in Fifth Wheel King Pin


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.




by:

Review from a similar Trailair Flex in Fifth Wheel King Pin


Product arrived in a timely fashion in an un damage condition. Quality was better than expected. Installation for me took about two hrs, with my wife helping. I placed the pin box in the bed of my truck with the help of a frontend loader and let it down on a floor jack. From there install was fairly easy.

Pros: Good quality Heavy Duty

Cons: You will need 3 or 4 strong friends to handle it
No instructions included I did find a pdf on the bottom of the page however that listed the torque for 1/2" bolts


Comments
Works great after a year of use preforms well. I haven’t had to put air after the initial start up.
Paul` - 08/28/2021


by:

Review from a similar Trailair Flex in Fifth Wheel King Pin


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.




by:

Review from a similar Trailair Flex in Fifth Wheel King Pin


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.




by:

Review from a similar Trailair Flex in Fifth Wheel King Pin


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!!!


Comments
I cannot believe it has been a year....and a trip to Perdido Key, FL and Breckenrigde CO. In addition to taking care of us, I have to tell you, it will take care of your trailer too! Improved our towing experience old pin box was an upgrade Rotoflex greatly. Worth every penny! If you did not see my earlier post, my friend and I installed it ourselves. Motorcycle jack in the back of a pick up bed. :
James J - 02/05/2020



by:

Review from a similar Trailair Flex in Fifth Wheel King Pin


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.




by:

Review from a similar Trailair Flex in Fifth Wheel King Pin


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.




by:

Review from a similar Trailair Flex in Fifth Wheel King Pin


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.




by:

Review from a similar Trailair Flex in Fifth Wheel King Pin


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.




by:

Review from a similar Trailair Flex in Fifth Wheel King Pin


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!




by:

Review from a similar Trailair Flex in Fifth Wheel King Pin


Love it! Makes the ride so much better and safer especially when you cross those roller-coaster bridges that will nearly bounce the rear tires off the ground without this hitch. Only complaint is that I have to add air if it sets for a couple weeks.




by:

Review from a similar Trailair Flex in Fifth Wheel King Pin


The FlexAir pin box has been great. The ride while pulling our Laredo 5th wheel is much smoother. Traveling is much more pleasurable. I especially appreciate the follow up from etrailer.




by:

Review from a similar Trailair Flex in Fifth Wheel King Pin


Dealing with you guys and your suppliers ment all kinds of information going in different directions and nothing ever jiving. Worst experience I've ever had with your delivery companies. Making promises never fulfilling them never calling ahead of time me having to chase them down when you chase him down you talk to somebody that is in the orient. They say will have someone call you in 1 hour. Never did they ever call back. I'll just stop is here because I don't want to get angry it's too upsetting. Finally got delivery 5 days after it was supposed to be here 3 days waiting all day long as promised and nobody showed up when you call back they say will have someone call you in an hour. They still have not called driver showed up here finally 5 days late said he didn't have my number you're the reason I know that it would be was here cuz he had a 40 ft tractor trailer




by:

Review from a similar Trailair Flex in Fifth Wheel King Pin


Packaging and delivery was spot on!! Truck backed up and dropped the new king pin right in front of my fifth wheel trailer for install. I'll follow up with more details once its installed.




by:

Review from a similar Trailair Flex in Fifth Wheel King Pin


This 250 lb item was shipped in a cardboard box that was just sitting on a pallet. When I opened the box I found the Flex Air was sitting upside down with the foam pad on top. I have no idea how the air filling nozzle wasn't damaged. Luck I guess. There were no "UP" markings on the box. No instructions were included.
Installation went smooth, it's just heavy so be careful. Instructions and videos can be found on-line.
The Flex Air is at least 4" taller than the OEM box that came with our Grand Design Reflection. I mounted the Flex Air as high as I could and lowered the receiver on the truck. The trailer is still nose high but seems to tow fine. My test ride was noticeably smoother. You can see a lot of motion on the Flex Air that would have otherwise been transferred to the truck.


Comments
Fifth Wheel tows smooth. After 5000 miles from Minnesota to the south east US. Freeway and bumpy back roads. Wind gusts up to 25 mph. The trailer tows smooth. No chucking. The trailer is still higher in the front but it has no noticeable effect on towing and the leaf spring suspension can handle it. The tires seem to be equally loaded, no uneven wear.
Steve t - 11/04/2020

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Show More Reviews

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

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    The Rhino # LC65VR is a stand alone item relative to the other available pin boxes, so not really a long or medium jaw since a Rhino pin box only replaces a Rhino pin box. This does not cross over to replace other makes. If you need a replacement pin box please let us know what model you currently have that we may provide recommendations.
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    We have cushioned pin boxes you can use to replace your Lippert Rhino pin box like with the Flex Air part # LC65VR but at this time we do not have any pivoting pin boxes that are a fit. The Flex Air pin boxes are the best cushioned option out there so the ride quality of your RV would greatly improve.
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    From previous customers we have determined that the 2021 Wolf Pack Forest River camper trailers have the Rhino Box pin box so for a cushioned Curt Flex Air that fits you'd want the part # LC65VR which has a 21k capacity and you'd be set. The Curt and the Lippert Flex Air pin boxes are the exact same and the Flex Air line is the most cushioned pin box that Lippert offers.
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  • Ordering the Trailair Flex Air 5th Wheel Pin Box
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  • Can Curt Flexair Pin Box be Used with Pullrite Hitch
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  • Cushioned Pin Box Replacement for Jayco Eagle 321RSTS with Rhino Box
    Since your Jayco Eagle 321RSTS has a Rhino Box pin box installed on it the best way to improve the ride quality is the Curt Flex Air pin box part # LC65VR. Unlike other options this does a really great job cushioning vertically and horizontally which will give you a much improved ride quality and would be the best option. You might also consider a fifth wheel hitch with a tighter jaw design to as that helps a lot as well like with the B and W Patriot hitch # BWRVK3255.
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  • Compatible Replacements For A Lippert Rhino Box Pin Box On A 2021 Cedar Creek 37MBH
    The Trailair Rota-Flex 5th Wheel Pin Box # LC328329 you linked to is a fit for the 1621 bolt pattern pin boxes so it will not fit your Lippert Rhino Box, but you have three other options that will. The first option is the MORryde Cushioned 5th Wheel Pin Box for 14K to 18K Trailers w/ Lippert Rhino # MR83QR. This cushioned model will dampen road shock and reduce back-and-forth chucking for a more relaxed towing experience. Unlike air bags, the internal rubber spring requires no maintenance. The...
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  • Will Trailair Rota-Flex 5th Wheel Pin Boxes Fit a Rhino Box
    The Trailair Rota-Flex 5th Wheel Pin Boxes, # LC328330 and # LC328329 are replacement/upgrades for the Lippert 1621 or 1621HD pin boxes. These will not fit a Rhino Box. However, we do have the MORryde Cushioned 5th Wheel Pin Boxes, # MR44HR for 11K to 14K and the # MR55QR for 18K to 21K trailers w/ Lippert Rhino and the Curt Flex Air 5th Wheel Pin Box - Lippert Rhino - 21,000 lbs., # LC65VR.
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  • Option for Replacing Rhino Box Pin Box to Gooseneck
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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jameson C
Expert Research:
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