What PSI Should I Run My Trailer Tires At?
Updated 10/05/2026 | Published 10/02/2026
Question:
Quick question regarding Westlake Tires 235/75R15 LRD. The tires are on aluminum LionsHead Wildcat Wheels 15x5, 5-4.5 bolt pattern. The pressure rating is 65 PSI. The question is - do you load straight to the 65 PSI each and every time you take a trip, no matter what your load is? I have them on a single-axle 2025 Rockwood GeoPro, GVWR just under 4000 lb, GAWR right at 4000 lb. I thought this was cut and dry until I talked to my brother who has Goodyears on his Rockwood Mini-Lite and Goodyear gave him some graduating scale on tire pressure based on load weight. I was somewhat surprised. I just want to be sure. I appreciate your time.
asked by: Duffy S
Helpful Expert Reply:
Hi Duff!
You do want to have the full/max psi when the tires are cold. This goes for basically every trailer tire brand, except Goodyear. They have done a lot more testing than other brands and do have a scale for weight ratings for different psi fills, but I'm pretty sure they are the only manufacturer that does that.
So with a Westlake 235/75R15 LRD tire, you will want to go to that 65 psi (if that's what is says on the sidewall of the tire) to get it's full capacity and life span.
Are you getting ready to head out on a trip, or just doing some general maintenance?
Dan S.
10/5/2026
I’ve run 2 sets of this exact tire pulling a 4100Lb travel trailer out west in various conditions such as interstate, 2 lane blacktop good and bad, and gravel too. I always run mine at 60Lbs cold and when they heat up by driving they’ll go to 66-72Lbs but that’s very ok, well within spec. I’ve pulled my trailer over 50,000 miles doing this. If a gravel road is partied with washboard, I’ll air down. Hope this helps.
Product Page this Question was Asked From
Westlake ST235/75R15 Radial Off-Road Trailer Tire - Load Range D
- Trailer Tires and Wheels
- Tire Only
- Radial Tire
- Load Range D
- 235/75-15
- 15 Inch
- L - 75 mph
- Westlake
more information >
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Duffy S.
10/2/2026
Yes, taking a 2400 mi. jaunt down Southwest way.