Is Taller Pin Box Available for a 2022 Vanleigh 41FLB 5th Wheel Trailer?
Updated 11/13/2025 | Published 10/27/2025
Question:
Hello, I have the Curt 21k Rota-Flex on my 2022 Vanleigh 41FLB fifth wheel. Im looking for a way to raise the the overall height of the pin box to increase height while towing to give more clearance to my generator muffler. I have the pin box set to the lowest setting, but still need about 2 inches of clearance. I tow with a 2017 Volvo VNL 730 HDT with the ET Senior hitch. Im looking for options to raise the ride height without raising the hitch on the truck. Maybe there is a different pin box that offers more height adjustments? I look forward to hearing from you. Thank you
asked by: Steve E
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Expert Reply:
Hey Steve, thanks for reaching out!
What's your reasoning for not wanting to adjust your ET Senior hitch? I looked it up out of curiosity and it has 2" of upwards travel so that would solve your issue right away and would be completely free as well.
Most pin box boxes have the same basic dimensions so that stresses are placed in the same locations on the trailer frame so I can't promise we'll be able to find something taller, but if you can let me know your pin box model number I'll be more than happy to see if we've got something that will help you out!
I need either the standard box number (like 1621 or 0719) or the serial number from the tag so I can ask Curt what the basic model number is. Let me know what you find!
Product Page this Question was Asked From
Curt Rota-Flex 5th Wheel Pin Box - Lippert 1621 - 21,000 lbs
- 5th Wheel Pin Box
- Upgraded Pin Box
- Absorbs Road Shock and Reduces Chucking
- 21000 lbs
- Rubber Spring Suspension
- Fixed Turret
- Lippert 1621
- CURT
more information >
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Jon G.
11/13/2025
Hey Steve, were you able to find the model or serial number on your Curt Rota-Flex pin box? Once you have that info, I can help check if there’s a taller option that could give you the clearance you need. Let me know what you find so we can narrow it down.