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What Reese Goose Box Do I Need for My 2021 Grand Design Solitude 3740BH?

Question:

Hello, I am looking for some assistance on buying the correct Reese goose box for my 2021 grand design Solitude S class 3740 bh. I have attached pictures. Additionally, I have a BW turnover ball installed and would like to purchase the 4”offset for additional clearance. Could you also provide the correct model number?

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Expert Reply:

Thanks so much for the photos and the information! I went ahead and called my tech at Lippert, and she confirmed that your 2021 Grand Design Solitude 3740BH has a 1621HD pinbox This is important to know when determining the bolt pattern on your pinbox. Also, from my available specs, your trailer has a gross vehicle weight of 16,800 pounds. With all of this in mind, the Reese goose box you need is the Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter # RP94720. I went ahead and attached an installation video walkthrough for your convenience.

As far as the 4" offset for your B&W Turnover Ball, there are a few different options:

- # BWGNXA4085 (if you do not have a Toyota Tundra or Dodge Ram 1500)
- # BWGNXA4585 (if you have a Toyota Tundra)
- # BWGNXA4685 (if you have a Dodge Ram 1500)

The offset you need depends on what truck you have.

Neighbor's Pin Box Tag
Neighbor's Pin Box Tag
(click to enlarge)
Current Pin Box on a 2021 Grand Design Solitude 3740BH
Current Pin Box on a 2021 Grand Design Solitude 3740BH
(click to enlarge)
Current Pin Box on a 2021 Grand Design Solitude 3740BH
Current Pin Box on a 2021 Grand Design Solitude 3740BH
(click to enlarge)
Current Pin Box on a 2021 Grand Design Solitude 3740BH
Current Pin Box on a 2021 Grand Design Solitude 3740BH
(click to enlarge)
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Bob C

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