How to Fix Excess Chucking While Towing Your 5th Wheel
Updated 01/14/2026 | Published 01/11/2026
Question:
Hello, my 5th wheel has a rotoflex pinbox rated at 14-18k. The rv has a gvwr of 10k. Im getting a lot of chucking! Can the 2 bolts on the side of the plate be adjusted? Or should I put a different one on? Thank you, Clayton
asked by: Clayton
Expert Reply:
Hey Clayton, thanks for reaching out!
The bolts on the side of the pin box should not be loosened. I know the arrows are a little confusing and seem to indicate adjusting will somehow control the chucking, but that is not the case. They are just a graphic to highlight that the head will pivot to help control chucking while towing.
That being said, if you're getting a lot of chucking, then the fifth wheel hitch is almost always the problem--not the pin box. The chucking can be solved by upgrading to a 5th wheel hitch that makes better contact with the king pin.
Which 5th wheel hitch do you have? And what's the year/make/model of your truck? I can give you some options once I get that info from you.
Jerry
1/13/2026
The roto-flex pin box worked as expected it doesn't take all the chucking out but it reduces a significant amount over a rigid pin box. You can watch it flex as you travel down the road so you know it is taking bumps and shocks out of your ride. Definitely a huge improvement. Thumbs Up
Josh B.
1/14/2026
Product Page this Question was Asked From
Trailair Rota-Flex 5th Wheel Pin Box - Lippert 1621 or 1621HD - 18,000 lbs
- 5th Wheel Pin Box
- Upgraded Pin Box
- Absorbs Road Shock and Reduces Chucking
- 18000 lbs
- Air Ride Suspension
- Fixed Turret
- Lippert 1621
- Lippert 1621HD
- CURT
more information >
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Clayton
1/12/2026
I have a 23 f150 and the hitch is rotoflex 14-18k. Someone told me to look at morryde pinbox up to 11,500k?? We have balanced the rv out the best i can?