How to Determine Correct Reese Goose Box for Grand Design 5th Wheel Trailer

Question:

I just purchased a 2021 grand design reflection 337rls and was wondering which Goosebox I need. Thanks.

asked by: Vince G

Expert Reply:

Trailers do not have specific pin boxes assigned to them so the only way to know the correct Reese Goose Box you need for your Grand Design Reflection is to know the model of pin box that is on it (we have no way of knowing this information, which is why you'll need to find it).

Thankfully, this is simple information to find out; if you do not have the trailer in hand yet just contact your local dealer with the VIN and you can contact Grand Design and they will let you know. Or, if you do have the trailer you should be able to just take a look at the pin box and there will be a model number on it that tells you exactly what you have.

The correct Goose Box for you will be one of the following:

- Lippert 0719, 1621 and 1621HD, as well as Fabex PB-600 Series pin boxes: Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter # RP85FR. (20,000 lb capacity)

- Lippert 0115, 1116 and 1716 pin boxes: Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter # RP94716-61301 (16,000 lb capacity)

I have added links to video reviews of each Goose Box for you to check out as well.