Recommended Air Spring Pressure for Reese Goose Box 5th-Wheel-to-Gooseneck Coupler RP94720

Updated 10/19/2021 | Published 06/15/2016

Question:

What is the optimum air pressure to run in the air bag to tow a 36ft 15000lb fifth wheel camper

asked by: Alice

Expert Reply:

On the Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapters like # RP85FR the internal air spring should be initially inflated to 35-psi pressure after the trailer is hitched and the landing gear have been retracted.

From that starting point you can use the indicator on the driver's side of the box (please see the linked photo) to fine-tune your pressure up to the maximum of 50-psi. The indicator will show green when you have reached near to the optimum pressure; once green just add a few more pounds of pressure and do a test-drive, applying the brakes a few times, which will automatically vent off any excess air pressure.

This procedure and other important information are contained in the unit's written instructions, which I have linked for you.

expert reply by: Adam R

click to enlarge

John V.

6/19/2020

My comment is more of a question about missing green markes. In May of this year I replaced my Tow travel trailer with a 5th wheel. I elected to replace the traditional 5th wheel hitches with the Lippert (Reese) goose-box. My issue is, I am unable to find any of the GREEN marking that about as the reference in setting the correct air pressure for tongue wt. I tried setting pressure down to zero and up to 50lbs, the only GREEN marking I'm able to locate is the sticker with an arrow pointing at the safe locking position. At this time I have set the current air pressure of 42 lbs by referencing a black bar (which will move up and down with air pressure changes) in the middle of the site hole (round hole) on the side of the pin-box. Thank you

Shane B.

11/28/2020

@JohnV I have the exact same issue as you with my brand new Reese Goosebox Gen2 that was purchased in November of 2020. I'm going to try 42psi as I currently have it set at 50psi.

Jon G.

11/30/2020

@ShaneB I believe the green mark that Adam is referring to is for an older-style Goosebox. The newer style uses the black bar that both you and @JohnV mentioned. Normal air pressure should have that black bar taking up about half of the air inflation indicator.

Shane B.

12/1/2020

@JonG I just came to that same conclusion prior to reading your reply, as I just got done towing my 17,000lbs 5th wheel RV this week and noticed the Black-Bar taking up half of the space in that circle air inflation indicator. BTW - Thanks for the quick reply!