Reese Goose Box Replacement for 1621 Pin Box
Updated 04/15/2025 | Published 03/25/2019
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Question:
I have a 2018 KZ Sidewinder 3610dk toyhauler, 15,000 GVWR. Im considering putting a, Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter - Lippert 1621 and 0719 - 20,000 lbs Item # RP94720, on to replace the king pin box. The camper currently has a Trailair Rota-Flex 5th Wheel Pin Box - 21,000 lbs which on your website is a 1621 pinbox, Item # LC328330 but I can not clearly find the number 1621 on the pinbox. The ID label was painted over. I cleaned it as best I could and I am pretty sure it says 1621 but I want to be sure before I place an order. Also since you offer the Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter - Lippert 1621 and 0719 - 20,000 lbs Item # RP94720, I take it that it is a product you trust or it would not be in your inventory. Ive read a lot about this item and was just wondering if you have any negative feedback from any that were purchased from you. I am trying to get as much as I can information before making the change to a gooseneck box. Thank you for your assistance and information.
asked by: Kevin E
Expert Reply:
KZ does not specify in their online manual which pin box they install but since you know you have the Rota-Flex # LC328330, which is compatible as a replacement for a 1621 or 1621HD pin box, you can be assured of the fit of the Reese Goose Box # RP85FR, which comes with new mounting hardware.
You can read what customers had to say after installing the Goose Box by referring the reviews which I linked for you. Goose Box # RP85FR has a high overall satisfaction rating. You can see more product details by viewing the linked video.
Dennis
4/13/2025
I am considering buying a 2025 KZ Durango D240RKD. I like the idea of the gooseneck for freeing up the bed of my 2024 Ram 2500 turbo diesel. Is there a gooseneck kingbox that would safely function to replace the stock kingbox?