Choosing The Correct B&W 5th Wheel to Gooseneck Pin Box For A 2021 Montana 3120RL
Updated 08/18/2026 | Published 08/12/2026
Question:
We drive a 2023 Ram 3500 SRW WITH PUCK SYSTEM. We want to get rid of our current hitch and go this route. Our RV is a 2021 Montana 3120RL. Can you help suggest what we would need to order?
asked by: David M
Expert Reply:
Hey David, thanks for reaching out. I can definitely help you get the right B&W 5th Wheel to Gooseneck Pin Box for your camper, but I'll need a bit more information from you first. Specifically, I'll need to know exactly which pin box your rig was equipped with from the factory. Pin boxes aren't make and model specific to the camper, so there is no way to look up your 5th wheel to know exactly which pin box you have.
The best way to find that out is with the numbers on your pin box sticker. There should be a sticker up on the side of the pin box brackets that has the item number, RPO number and serial number. If you can send me those numbers I can look up your pin box info and determine exactly which one you have.
For example, the B&W 5th Wheel to Gooseneck Pin Box # BW73RV you were looking at replaces the Lippert 1621 and 1621HD pin boxes which are some of the most common sizes out there. We just need to nail down exactly which one you have, and we can get you set up.
What is the model number and serial number on your pin box sticker?
(click to enlarge)
Product Page this Question was Asked From
B&W 5th Wheel to Gooseneck Pin Box - Lippert 1621/1621HD - 25K GTW - 3.25K TW
- 5th Wheel Gooseneck Adapter
- Adapts Trailer
- 5th Wheel Trailer to Gooseneck Hitch
- No Extra Clearance
- 25000 lbs
- Replaces Pin Box
- Shock Absorbing
- Lippert 1621
- Lippert 1621HD
- B and W
more information >
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on 5th Wheel Gooseneck Adapter
