How to Determine Correct Air Ride Pin Box For Montana 3781RL
Updated 02/03/2026 | Published 07/02/2024
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Question:
Considering the air ride kingpin for my 2023 Montana 3781rl. Which part number fits/corresponds with my fifth wheel?
asked by: Brian
Expert Reply:
Hi Brian,
Good choice with the Air Ride as that's really going to give you a more comfortable towing experience with your Montana 3781RL. That said, we don't have any way of knowing off-hand what Air Ride fits your trailer or what model Road Armor you have, so you'll have to do a bit of measuring. The bolt pattern on your pin box is likely going to be a Lippert 1621 or 1116,
If you have the Lippert 1116 bolt pattern you'll need the Air Ride 5th Wheel Pin Box # LC155943 while for the Lippert 1621 you'll need the Air Ride 5th Wheel Pin Box # LC158778.
I have added a link below to a help article titled "4 Steps to Choosing Your 5th Wheel Pin Box" which details the measurements needed. Just scroll down a tad and you can see what measurements each has and compare yours to that.
Product Page this Question was Asked From
Trailair Air Ride 5th Wheel Pin Box - Lippert 1116 - 21,000 lbs
- 5th Wheel Pin Box
- Upgraded Pin Box
- Absorbs Road Shock and Reduces Chucking
- 21000 lbs
- Air Ride Suspension
- Fixed Turret
- Lippert 1116
- Lippert
more information >
Featured Help Information
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Jerred H.
2/3/2026
Hey Brian, what did you find when you measured the bolt pattern on your Montana 3781RL? Once you confirmed whether it was the Lippert 1116 or 1621, did the Air Ride pin box fit the way you hoped? Your update could make it easier for others matching their pin boxes.