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


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


Expert Reply:

On the Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapters like # RP94720 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air spring should be initially inflated to 35-psi pressure after the trailer is hitched and the landing gear have been retracted.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.

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Follow up Questions

John V.
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
Reply from Shane B.

@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.

Etrailer Expert
Reply from Jon G.

@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.

Reply from Shane B.

@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!

Reply from Kode R.

@ShaneB When I try to add air to mine u can't seem to get the bar in the "viewing window" to move. It sounds as if im not properly connected eventhough i know I am. Any advice?

Reply from Jason H.

@KodeR What pressure are people running with 16,000 pound trailers with the best towing experience. I’ve tried 30, 35, 40… I’m not sure what I should run for optimum experience. I can’t grasp what will happen as I add pressure??? Will the ride be stiffer from the trailer, and less pressure is softer but more bouncy?

Etrailer Expert
Reply from Les D.

I believe the green mark you referenced is referring to is for an older-style Goosebox. The newer style uses a black bar. Normal air pressure should have that black bar taking up about half of the air inflation indicator.

Etrailer Expert
Reply from Les D.

@ JasonH You should initially inflate to 35 PSI, then add to, or take away, pressure until the indicator is in the middle. All this never to exceed 50 PSI.

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