Highest Capacity Reese Goose Box For 5th Wheel Trailer

Question:

What size reese goose box do I need for my 2018 montana 3811 ms fifth wheel? I had one installed when I bought it new, but was told they put a smaller one on then I needed. The air spring will not hold air also.

asked by: James T

Expert Reply:

I assume by "smaller one" you are referring to the capacity, and that likely means you have a 16,000 lb capacity Reese Goose Box, which would not be high enough for your 2018 Montana 3811MS 5th wheel with a 16,705 lb GVWR. The largest capacity Goose Box is 20,000 lbs, and is the following:

- Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter # RP85FR

The # RP85FR will also work as-is to replace a Lippert 1621, 1716, 0719, Rhino, or Fabex PB 600 Series pin box.

expert reply by: Kyle S