Gen-Y Hitch Shock Absorbing 5th Wheel Pin Box for 2020 Grand Design Momentum 350G

Updated 10/23/2025 | Published 10/21/2025

Products Featured in This Question

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

(88)

$1156.32

Gen-Y Hitch Shock Absorbing 5th Wheel to Gooseneck Pin Box - Lippert 1621/1621HD - 30K GTW - 6.5K TW

(88)

$1999.95

Question:

Hello, I have a 2020 Grand Design momentum 350G Toy Hauler. Im looking at replacing the Lippert Pin box with a Gen Y Executive 5th Wheel King Pin Box. I am looking for a recommendation as to which Gen Y Pin Box part Number I need. Ive included a picture of the Lippert Tag. The Lippert Tag Info: S/N: S004041772 LCI Item Number: 762440 Thank You for any help. Willie

asked by: William P

Pin Box Sticker
(click to enlarge)

Expert Reply:

Hey Willie! Thanks for the picture. The pin box on your 2020 Grand Design Momentum 350G has a 1621 bolt pattern. It looks like your GVWR is 16,800 lbs so you want the 6.5k TW model # GY95GR.

Any big trips coming up with your toy hauler before winter sets in?

expert reply by: Robin H

Gen-Y Pin Box
(click to enlarge)

William P.

10/23/2025

Hi Robin, Thanks for the reply. My trailer's pin weight is 2600lbs. Based on that I thought I needed the 4.5k Model?

Robin H.

10/23/2025

@WilliamP Gen-Y improved the pin boxes and updated their guide on these to cover a wider range, and fitment is based strictly off of GVWR now. I would trust what they say about it since they're reliable and test their products thoroughly. If your GVWR is 16,365 - 25,450 lbs the 6.5k is the one you want to use. The 4.5k is for 7,275 - 16,360 lbs.