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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.

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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 # RP94720

The # RP94720 will also work as-is to replace a Lippert 1621, 1621HD, and 0719 pin box. If your Montana originally had a Lippert 1716, 1116, or 0115, you would need to add Spacer Kit # RP61301.

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Kyle S

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