Determining The Correct Reese Goosebox For A 2021 Keystone Carbon 358

Updated 08/16/2023 | Published 08/15/2023

Question:

Which reese goose box do i need to order for a 2021 Keystone Carbon 358?

asked by: Jake

Expert Reply:

To determine the correct Reese Goosebox to replace the current pin box on your 2021 Keystone Carbon 358 we'll first need to determine the bolt pattern. Manufacturers don't list the bolt pattern on the pin boxes anymore but they will typically have a tag that lists an RPO and serial number (example pictured below). With this information we can look up the bolt pattern. If for some reason the tag on your pin box is missing then we also have a help article that will walk you through how to measure for the bolt pattern. If you have a Lippert Rhino Box it'll also have Rhino labeled all over it and is super easy to identify.

The Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter # RP85FR you were looking at fits the following bolt patterns:

Fabex 600
Lippert 0719
Lippert 1621
Lippert 1716
Lippert Rhino

expert reply by: Kevin C