Curt Air Pin Box for 2018 DRV Mobile Suites 36RSSB3

Updated 07/31/2026 | Published 07/24/2026

Question:

what curt air pin box for 2018 mobile suites 36rssb3, would you recommend

asked by: Ed C

Expert Reply:

Hey Ed! The correct Air Ride pin box depends on the bolt pattern on your trailer. It looks like you went ahead and picked up the Curt Air Ride 5th Wheel Pin Box - Lippert 1621 & 1621HD # LC158778. As long as you have a Lippert 1621 or 1621HD bolt pattern this is the correct model for your setup. It is also properly rated for your 20,000 lb GVWR.

Where are you headed next once you get your upgraded pin box installed?

expert reply by: Robin H

Curt Air Ride
(click to enlarge)

Rrr

7/30/2026

2024 Forrest River Heritage Glen After getting the wrong one from Amazon I ordered from e trailer. Had my local shop do the installation. We are really happy with it especially since the freeways in MI, OH, and PA leave a lot to be desired!

Robin H.

7/30/2026

@Rrr thanks for the feedback! I'm glad everything worked out after getting the correct pin box. It sounds like it's been a worthwhile upgrade, especially with the roads you travel.

Bill

7/30/2026

I have a Forest River Hemisphere 36FL, we were dolphining bad. I added the Curt pin box myself using my tailgate and 2 Jack's. The hole pattern left me with all the OEM bolts and one extra open on each side, Lippert said as long g as the original bolts are in, it's good. The dolphining has almost disappeared, the ride is fantastic compared to what it was.

Robin H.

7/31/2026

@Bill that's great to hear! It's amazing what a difference the right pin box can make. I appreciate you taking the time to come back and let us know how it worked out.