Is this right For you? Product Expert Kathleen M says:
Yes, if you:
Are upgrading from a solid pin box and want something just a little more forgiving to soften the ride
Hate having to do maintenance - no need to find an air tank or make any adjustments before taking off
No, if you:
Frequently drive over really rough, washed-out backroads or poorly maintained highways and need something to give you more cushion
Have a Curt Q-Series fifth wheel hitch or a gooseneck adapter
This Rota-Flex pin box has a pivoting head with a built-in rubber compound that works to reduce chucking and absorb road shock, resulting in a smoother ride and less wear and tear on your trailer. Replaces Lippert 1116 pin boxes. 1-800-496-5010 to order CURT fifth wheel king pin part number LC176440 or order online at etrailer.com. Free expert support on all CURT products. Guaranteed Lowest Price and Fastest Shipping for Curt Rota-Flex 5th Wheel Pin Box - Lippert 1116 - 19,000 lbs. Fifth Wheel King Pin reviews from real customers.
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Reviews (21)
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Why etrailer?
CURT Fifth Wheel King Pin
- LC176440
Lippert 1116
19000 lbs GTW
Absorbs Road Shock and Reduces Chucking
CURT
Upgraded Pin Box
Fixed Turret
This Rota-Flex pin box has a pivoting head with a built-in rubber compound that works to reduce chucking and absorb road shock, resulting in a smoother ride and less wear and tear on your trailer. Replaces Lippert 1116 pin boxes.
Features:
Pivoting pin box replaces standard pin box on your 5th-wheel trailer to improve handling and limit strain on the truck and trailer
Minimizes chucking by allowing controlled movement of 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 1116 5th-wheel pin box
Weight capacity: 19,000 lbs
1-Year limited warranty
Notes:
Do not use the Curt Rota-Flex pin box with any type of gooseneck adapter.
The Curt Rota-Flex is not compatible with Curt E-Series or Q-Series 5th wheel hitches.
The Rota-Flex pin box has a pivoting head and built-in rubber compound that help to reduce checking and absorb road shock for a smoother ride as you tow your fifth-wheel trailer.
Pivoting Head Reduces Chucking
The pivoting head on the Rota-Flex 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 Rota-Flex 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.
Rubber Compound Absorbs Road Shock
A heavy-duty rubber compound is built into the head assembly of the Rota-Flex pin box. This rubber absorbs the bumps and vibrations, or road shock, 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 Rota-Flex takes the beating so there's less wear and tear on your trailer or RV and you get a smoother ride.
Easy, Bolt-On Installation
The Rota-Flex is easy to install. Simply remove your existing Lippert 1116 pin box and install the Rota-Flex on your trailer or RV. The Rota-Flex uses the same bolts that held on your original pin box so no additional hardware is required. Plus, it comes out of the box ready to be put on your trailer, so no assembly is needed. Because the Rota-Flex is quite heavy, you should put it on an elevated surface or have a friend help you support its weight during installation.
176440 Curt Rotaflex Fifth Wheel Kingpin Box for Lippert 1116
Replaces 176440 Lippert Components (LCI) Rotaflex by Trail Air Fifth Wheel Kingpin Box for Lippert 1116
Average Customer Rating: 4.6 out of 5 stars (21 Customer Reviews)
This Rota-Flex pin box has a pivoting head with a built-in rubber compound that works to reduce chucking and absorb road shock, resulting in a smoother ride and less wear and tear on your trailer. Replaces Lippert 1116 pin boxes.
by: Juventino03/17/2022
It's a great pinbox. Really helped with chucking and compatible with my Demco sliding hitch. Also no issues with delivery, was helped by Pam and Jessie. They are awesome people to work with.1273682
Perfect replacement for my unit. The movement in the mount helps with the shock on the hitch itself. The unit is very strong and after a year I have had no problems. The instructions were spot on and shipping was very fast. I recommend this pin box as it is more economical than others I have seen but really helps on the bump and pull with a solid hitch1224114
by: Michael 08/07/2022
It did what it was advertised to do. 1349095
by: Richard 08/31/2021
The pin box made the 5th wheel handle better, with less chucking and very stable.1140144
by: Mike06/22/2018
Got it on and ready to try. It fit nicely. Did it myself in about an hour . Nothing left of the box it was in but other than a couple of scratches the pin box itself was in good condition 525560
Definitely dampened the chucking and my wife is much happier with the ride. Also it seems to be much quieter. Noticed at the camper show many units come with the Roto flex from the factory.603833
by: Robert R09/23/2017
The hitch arrived poorly packaged in a cardboard box. The hitch is very heavy. It was scratched and required repainting.
The hitch itself looks well made and strong.435592
by: David 10/05/2020
I installed this by myself (it is heavy!) by putting it in the bed of my pickup & strapping it to a floor jack but not a job I’d recommend doing it by yourself. I already have airbags on the rear axle of my pickup is why I chose this king pin . Only a 200 mile trip and the bucking on the 5th wheel was gone. But the real test will be on a rough highway...897336
by: Bob 09/29/2020
Have not installed yet, paint has been scraped off in several locations especially on top and on the rounded corners from shipping. Will have to do some touch up painting. Excited to get installed and pull trailer next weekend894336
by: Sean 06/20/2020
Great product, Installed and what difference the ride. Thanks SJ McDonnell818618
Comments
Great hauls good thanks
Sean M - 06/21/2021
115821
by: Jim S. 08/06/2017
Works great eliminated the jaring. Also shorter so I can make a hard turn without touching the sides of my box 416803
by: Larry03/26/2022
Review from a similar Trailair Rota-Flex in Fifth Wheel King Pin
The shipping container was not adequate for pin box. It was too large and no protective packing was used to protect the powder coated finish. When it was delivered by UPS the carton was destroyed. I had to repaint it as it was badly chipped from rough handling. I am disappointed in the performance as I do not see any difference in the chucking which is the reason why I purchased it. If I were to get a different 5th wheel I will not purchase a Rota-Flex again.1277611
Comments
With the Rota-Flex, it is meant to reduce the amount of chucking that comes with hauling a 5th Wheel trailer. However, there are a lot of factors that can be the cause of chucking, such as: the nose being high or the nose being down, too much weight in the rear of the trailer, or even a 5th Wheel hitch that has a more loose or lower tolerances in the jaw. Due to all of these factors, you might not be able to notice any difference or the chucking can even become worse, depending on the situation. I also see that you have received some damage to your pin box, when it comes to shipping, it is possible that the pin box could have been scratched. We recommend using a rust-oleum type of paint to prevent any corrosion. I have a link below for your reference. I have also sent this information over to our customer service team for them to better assist you.
Review from a similar Trailair Rota-Flex in Fifth Wheel King Pin
Received on Wed. as planned. With a little help from my forklift, I had this trail air pin box installed in few hours. Fit perfect on my Sabre. Drove around the block, about 4 miles. This pulls so nice, it is like nothing behind you. Thanks etrailer.636450
Review from a similar Trailair Rota-Flex in Fifth Wheel King Pin
Worked fine, easy to install only used for one trip to Michigan and sold trailer.1326477
by: laluck82007/16/2016
Review from a similar Trailair Rota-Flex in Fifth Wheel King Pin
The product was great, The better part was how fast it got to me . I had it put on the camper the same day i had received it what was 3 days after my order. Now you can't beat the shipping. All my orders from ETrailer has been fast and on time . Thank you all at Etrailer.272725
Review from a similar Trailair Rota-Flex in Fifth Wheel King Pin
Chelsea was very helpful and the product is very good. The Roto flex was very easy to install Great product.1332900
by: Troy05/18/2016
Review from a similar Trailair Rota-Flex in Fifth Wheel King Pin
Looks great on my 5th. If anyone else has wondered as I did and could not find anything online regarding the vertical height difference between this trail air rota flex and my standard lippert 1621. This pin box will reduce the nose of my 5th by 2" mounted in the same location. Now to pull my rear axle spacers on my dodge to get another 1.5" lower. Etrailer is great as always. Never had a problem with them and have ordered here many times. Thanks Etrailer!250771
by: Bill A.09/14/2017
Review from a similar Trailair Rota-Flex in Fifth Wheel King Pin
This king pin assembly works well to get the chucking down. I do feel at times do to road conditions that I still feel some, but over all it has helped the ride and I feel it has take some abuse away from my truck and the trailer seems to ride better. Overall I am pleased with the kingpin assembly for the cost. The only thing I cannot do is put my cover on that was on my old kingpin.432321
by: Steve 04/21/2021
Review from a similar Trailair Rota-Flex in Fifth Wheel King Pin
The Trailair Rota-Flex pin box worked great. The pin box did the job by removing 80% of the chucking as we traveled.1017937
by: Denise 11/17/2021
Review from a similar Trailair Rota-Flex in Fifth Wheel King Pin
Great quality, great customer service - I’ll use E-trailer for everything I can now!1205788
by: Marshall12/24/2021
Review from a similar Trailair Rota-Flex in Fifth Wheel King Pin
Great product, unfortunately I was very displeased with how it was delivered. The product was unwrapped and had the potential to be scratched up and chipped.1230229
Comments
Customer service will reach out to you. It is important to cover all bare metal with anti-corrosive paint to avoid rust. I have attached a help article regarding this.
Review from a similar Trailair Rota-Flex in Fifth Wheel King Pin
Fast Shipping,Great product,It sure softens up the ride! Doesn't eliminate all the jerking but overall quite satisfied! Quality built product. Definitely not a one person job so seek out a helper to hold things Thanks Etrailer.86296
Comments
This king pin box came on my 5th wheel, it does not help the jerking at all. I am now looking to install a different pin box.
-- comment by: Gene - 10/19/2013
2207
Thanks for the feedback. If you need help finding a different pin box, please let me know. We carry Ultra-Fab, Fifth Gear and Reese pin boxes in various versions.
-- Patrick B - 10/23/2013
by: Marvin09/12/2018
Review from a similar Trailair Rota-Flex in Fifth Wheel King Pin
Had trouble receiving the hitch through UPS (they lost it --[48 miles from my residence] conversation with Stacy at etrailer and they shipped another, which my wife and I installed. etrailer was very helpful in sending another to replace the one UPS lost. Thanks so much564168
by: Jon02/17/2022
Review from a similar Trailair Rota-Flex in Fifth Wheel King Pin
Excellent service. Fast delivery and great price.1263927
by: Tom04/26/2018
Review from a similar Trailair Rota-Flex in Fifth Wheel King Pin
I received my order promptly, faster than expected for a large item. I paid for my pin box, checked the next day and etrailer had dropped the price, they refunded the difference which impressed me greatly. I am a repeat customer and have not had a bad experience ever.500967
The Mor/Ryde pin boxes and the Trailair RotaFlex like part # LC176440 are pretty similar in how they cushion the ride. The Mor/Ryde is definitely more common out there on the road, but the feedback I've read on people who have tried both said they were very similar. view full answer...
The Trailair Rota-Flex 5th Wheel Pin Box - Lippert 1116, # LC176440, is designed to be a direct replacement for the Lippert 1116 pin boxes, if you have a 1116 pin box then this will fit. Please see attached image for bolt pattern and note the attached video for visual in points of measurements. I am uncertain what specific measurement you are wanting but this video covers multiple points across the three rows on this pin box plus width and length. view full answer...
Your Reese 16k hitch would easily work with the Rota-Flex pin boxes like # LC176440 without issue. The ability of the hitch head to pivot would not be a problem for the Rota Flex. This is true for all Reese hitches. view full answer...
For the Curt Rota-Flex 5th Wheel Pin Box # LC176440, Curt recommends to reuse the old hardware that was removed from the original pin box, unless they are damaged or unusable.
The torque spec is dictated by the type of bolt that is used along with the type of metal it is made of. For example, if you have 1/2"-13 grade 5 zinc plated bolts, then the proper torque spec is, 65 ft-lbs.
I have attached a chart that expands upon this, provided by Curt. view full answer...
The ride quality between the MORryde and the Rotaflex pin boxes are about equal. I did some digging and the Keystone owners seem to mostly like both of them about the same. Some people preferred one over the other but in general I would say you aren't going to see a huge difference. One thing that was mentioned with the Rotaflex was that it squeaks a bit though. view full answer...
The cushioned Trailair Rota-Flex 5th Wheel Pin Box # LC328330 does fit the Fabex 665 that you have now and would work great as a cushioned replacement. While this pin box states it's designed to fit as a replacement for the Lippert 1621 or 1621HD we've found that in general the 1621 and the Fabex 665 are identical. view full answer...
For your 2019 Keystone Sprinter Limited Fifth Wheel trailer that has a Lippert 1116 pin box installed on it currently the best cushioned upgrade option we have is the Trailair part # LC155943 which uses an air bag and shock to cushion bouncing and jarring. This option will do the best to cushion the ride quality and also has more capacity than you'd need as it's rated for 21,000 lbs trailer weight. view full answer...
The Trailair Air Ride 5th Wheel Pin Box - Lippert 1116 - 21,000lbs Item # LC155943 has two different placements when installing but as you can see in the attached dimension spreadsheets it has an overall height of 17-7/16" whereas the Trailair Rota-Flex 5th Wheel Pin Box - Lippert 1116 - 19,000lbs Item # LC176440 only has an overall height of 11.05". The # LC155943 is going to sit higher but you also need to make sure you aren't raising too much and placing your camper out of level as this... view full answer...
Thank you for the pictures, you have a Curt Rota-Flex 5th Wheel Pin Box - 19,000lbs # LC176440 with a 1116 bolt pattern so the Trailair Air Ride 5th Wheel Pin Box - Lippert 1116 - 21,000lbs # LC155943 you were wanting to install will be a compatible fit. view full answer...
The Rota-Flex part # LC176440 would fit as a replacement on your trailer that has a Lippert 1116 on it currently. But this product has the same dimensions as your current pin box. These are designed to be basically exact replacements that are cushioned. Extending a pin box out further than what the trailer had can put added stress on the trailer's frame due to the increased leverage.
The only solution we can offer is to replace your Companion hitch with the sliding Companion part # BWRVK3400.... view full answer...
If you need additional pin box length for turning clearance with your trailer that has a Lippert 1116 pin box we have a great solution, but the Rota-Flex you mentioned does not provide additional turning clearance so it would not be the way to go. Instead what you'd want is a Sidewinder pin box # RP61412 which moves the pivot point back 22 inches so that even with super short truck beds you'll have the clearance needed to make tight turns. view full answer...
The Trailair Rota-Flex 5th Wheel Pin Box # LC176440 that you referenced will work well to provide a more comfortable ride but it won't help with the cab clearance issue you're having with your short bed truck. The dimensions on the pin box will be fairly similar to your existing Lippert 1116 pin box, which is what this is designed to replace.
If you have a Lippert 1116 model pin box the best solution for adding both the needed turning clearance and a more comfortable ride is with the... view full answer...
I reached out to my contact at Lippert who said that the current Rota-Flex you have on your 5th wheel trailer is the part # LC176440 which is rated for 19K and pin box number 1116.
The correct Sidewinder replacement is part # RP61412 on our site which is rated for 16K. This comes with a universal wedge to lock out the king pin but if you can tell me what 5th wheel hitch you have I can let you know if there are any custom wedges that would offer a better fit.
Please also note the attached... view full answer...
The inside height of the the 2021 Ford F-350 Super Duty bed is 21.1" and the width is 66.9". The Trailair Rota-Flex 5th Wheel Pin Box - Lippert 1116 - 19,000lbs Item # LC176440 is approximately 23.25" from the king pin to the rear bolt hole. Depending on the side plates it brackets to you might not have any added height off of the 5th wheel hitch. So you'll want to have your hitch set to it's highest setting to ensure you can get as much clearance as possible.
With the bed width being... view full answer...
The Trailair Rota-Flex 5th Wheel Pin Box - Lippert 1621 or 1621HD -18,000 lbs # LC328330 and the 21,000 lbs # LC328329 are 12-1/2 inches wide. The sizes of pin boxes for width are simply 12 inches or 12-1/2 inches so you would definitely want the 12-1/2 inch pin box.
You will want to check your current pin box number which should be on a sticker on the actual box itself. If not there, you will want to measure your mounting bolts to ensure the correct fit. I've attached an article... view full answer...
I have a solution for you, but the Trailair Rota-Flex # LC176440 pin box is designed to replace 5th wheel trailers with a Lippert 1116 pin box and not the 1621 pin box. Instead, you'll want to use either the # LC328330 (trailer with GVWR of less than 18000-lbs) or the # LC328329 (trailer of GVWR less than 21000-lbs). The Trailair Rotaflex is a great solution to help reduce the bouncing and jarring that car be experienced with an uncushioned pin box and will be a great upgrade for your towing... view full answer...
Thanks to the item number from your current pin box my contact at Lippert was able to confirm that your 2018 Keystone Raptor 355TS has a Trailair Rota-Flex 5th Wheel Pin Box - Lippert 1116 # LC176440 which has a 19000lb weight capacity and uses the 1116 bolt pattern.
You will need the Trailair Air Ride 5th Wheel Pin Box - Lippert 1116 # LC155943 is designed to replace your 1116 bolt pattern pin box and offers a 21000lb weight capacity. This pin box will offer a much smoother ride due to... view full answer...
Yes, you can use a Trailair Rota-Flex 5th Wheel Pin Box like # LC176440 (which replaces Lippert 1116) or # LC328329 (which replaces Lippert 1621) with the B&W Companion 5th Wheel Trailer Hitch # BWRVK3500.
I have linked video reviews below for you to check out of both the Rota-Flex and the Companion. view full answer...
The Rota Flex pin box comes in either a 1621 # LC328330 or 1116 # LC176440 bolt pattern.
For an upgrade I recommend the Trailair Flex Air 5th Wheel Pin Box # LC369535 for a 1621 bolt pattern or the Trailair Air Ride 5th Wheel Pin Box # LC155943 for a 1116 bolt pattern. These pin boxes are both rated for 21,000lbs to ensure you safely tow your 2017 Keystone RV Raptor 5th Wheel Toy Hauler 425TS with a 15860lbs dry weight. The Flex Air drastically reduces chucking, absorbs road shock, and... view full answer...
Since you don't want the an Air Ride pin box I recommend the Trailair Rota-Flex 5th Wheel Pin Box - Lippert 1116 - 19,000lbs Item # LC176440. There's only about a 1-2" difference between different 1116 style pin boxes. This Rota-Flex pin box has a pivoting head with a built-in rubber compound that works to reduce chucking and absorb road shock, resulting in a smoother ride and less wear and tear on your trailer.
Normally I would say to use a sidewinder or slider to gain turning clearance... view full answer...
The Gen-Y Hitch Shock Absorbing 5th Wheel to Gooseneck Pin Box # GY48FR would be the pin box you want to use on your 2018 Keystone Montana 5th Wheel. This Pin box has the 25,000lb towing capacity with a tongue weight rating of 2,500lbs to 4,500lbs.
The 19K Trailair Rota-Flex 5th Wheel Pin Box # LC176440 is only offered in a 1116 bolt pattern that matches the Gen-Y hitch I have recommended above. view full answer...
I went ahead and reached out to my tech at Lippert (who designed the Rota-Flex # LC176440 for Curt), and they confirmed that the reason why Curt E series and Curt Q series hitches like the Curt Q16 is not compatible with the Rota-Flex is because the articulating movement of the hitch interferes with the pivoting movement of the pin box. These two mechanisms work against each other.
With that being said, if you have the Lippert 1116 pinbox, a great alternative that does not have a pivoting... view full answer...
To replace your existing Rota-Flex 5th wheel pin box with the Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter # RP94720, you'll need to confirm its model number and weight rating. This information is typically displayed on a sticker or plate on the pin box itself.
Lippert makes three models of the Rota-Flex, so the weight rating on the label is enough to identify which of these three you have:
-Model 1621/1621HD Trailair Rota-Flex 5th Wheel Pin Box 18,000 lbs # LC328330
-Model... view full answer...
Yes, Demco Capture Plate # DM6171 fits their Hijacker 18K Autoslide 5th Wheel Trailer Hitch head assembly # DM6077 when it is used with a trailer that has a Trailair Rota-Flex pin box like # LC328330 (18K), # LC176440 (19K) and # LC328329 (21K). view full answer...
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