Fifth Wheel to Gooseneck Adapter to Replace Lippert 1621 Pin Box

Published 08/27/2021

Products Featured in This Question

Convert-A-Ball Cushioned 5th-Wheel-to-Gooseneck Adapter - 12" to 16" Tall - 20,000 lbs

(988)

$608.77

Gen-Y Hitch Shock Absorbing 5th Wheel to Gooseneck Pin Box - Lippert 1621/1621HD - 30K GTW - 4.5K TW

(267)

$1802.13

Question:

Looks like you have a Rotoflex pin box and installed a Convert-A-Ball adapter part # CAB-C5G on it which isn't supposed to happen. The king pin plate flexes and causes the issue you have. If you can get me the pin box part numbers you see on it I can see what adapter solutions you have.

asked by: Rod M

Expert Reply:

Looks like you have a Rotoflex pin box and installed a Convert-A-Ball adapter part # CAB-C5G on it which isn't supposed to happen. The king pin plate flexes and causes the issue you have.

If you can get me the pin box part numbers you see on it I can see what adapter solutions you have.

expert reply by: Jameson C

Roto Flex with Convert A Ball Adapter
(click to enlarge)

Rod M.

8/27/2021

Jameson C.

8/27/2021

The Reese Goose Box part # RP85FR would fit in place of the Roto Flex setup you have now. It would be much safer too. Gen-Y has their cushioned adapter that is similar too with the part # GY38FR.