Will B&W Gooseneck Pin Box Work With 2025 Forest River Riverstone Legacy 39RKFB
Updated 08/18/2026 | Published 05/24/2026
Products Featured in This Question
Question:
Will this hitch work with a 2025 Riverstone 39RKFB. 21,000 lb GVWR, approximately 3,800 lbs pin weight. Which part number would be correct for this fifth wheel? Thank you, Jim
asked by: Jim H
Helpful Expert Reply:
Hey Jim! Yes, the B&W Gooseneck Pin Box can be used on your 2025 Riverstone 39RKFB. However, you need to determine the pin box bolt pattern to find the right model. The # BW83RV you were looking at is designed for a Lippert 1621/1621HD bolt pattern (also fits 1116/1716 with shim kit # BW57MV). If you have the Rhino Box you need # BW55RV instead.
If you aren't sure which bolt pattern is on your 5th wheel, feel free to send me a picture of the pin box sticker and I will identify it for you.
Where are you headed with the Riverstone once you upgrade your pin box?
(click to enlarge)
Charlie T.
8/18/2026
So to be clear, if I want the 4.5k tw model and I have a 1716 bolt pattern I need the 1621 pin box bw83rv along with the bw57mv shim kit?
Product Page this Question was Asked From
B&W 5th Wheel to Gooseneck Pin Box - Lippert 1621/1621HD - 25K GTW - 4.5K 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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Jim H.
5/28/2026
We have a trip planned to Theodore Roosevelt NP, Glacier NP, and Yellowstone NP but not sure I can work in the upgrade before we leave. We will make the change before we head to AZ for the winter.