Will a Curt Helux Shock-Absorbing 5th Wheel Pin Box Fit a 2015 Forest River?

Updated 03/04/2026 | Published 01/30/2026

Products Featured in This Question

Curt Helux Shock-Absorbing 5th Wheel Pin Box - Lippert Rhino - 18K GTW - 2,600 lbs TW

(24)

$1495.95

Question:

Curt Helux Shock-Absorbing 5th Wheel Pin Box - Lippert Rhino - 18K GTW - 2,600 lbs TW. Will this fit a 2015 Forest river 3850 398t 5th wheel?

asked by: Rick M

Expert Reply:

Hey Rick. The Curt Helux Shock-Absorbing 5th Wheel Pin Box item # C25MJ, will only replace a Rhino Pin Box. Seeing as how you have a 2015 trailer that is not likely because the Rhino Box wasn't released until 2019-2020. It's quite a bit more narrow than your standard 1116 or 1621 styles.

The Curt Helux's are only designed to fit a Rhino pin box. We have other alternatives for shock absorbing pin boxes or gooseneck adapters.

If you would like a recommendation, I'll need the information on the sticker that's attached to your current pin box. The sticker should say date of manufacture, weight capacity, and have some form of RPO, LCI, or serial number on it. I attached a picture below of one from a different trailer.

If you could email me a picture of yours or carefully put all that information where it says Add Comment, I can find the right pin box for you.

expert reply by: Jerred H

Pin Box Sticker
(click to enlarge)

Jerred H.

3/4/2026

Hey Rick, were you able to find the info from the sticker on your current pin box? Once you have those details, I can help narrow down which shock-absorbing option will fit your trailer.