The max is 65 psi, what would you recommend for a 6x8 Cargo Trailer? LT275/60R20 119S

 

Step 1: Check the tag in your driver door jamb to reference the rear axle GAWR and then divide it by 2. That is the minimum each tire needs to be able to carry.

Step 2: Refer to the Load & Inflation Table Application Guide and look up your tire size and the weight calculated in Step 1. Inflate to that PSI.

Example: If each tire needs to carry 2,850 lbs, inflate to 55 PSI.

 

This is a photo my door jam and tires, the tires are different than what's on the door.

Do you think I'd be fine with 55 or should I bump them to 60psi?
This would be a 8 hour trip we are going on and I want to be sure I don't have problems.

https://tirepsi.com/lt275-60r20-tire-pressure

 

Your rear GAWR is 4050 lbs. This is the most your rear axle is rated to carry. With 4050 divided by 2, each tire needs to be able to carry 2050 lbs.

Based on your link and the link to the chart that I provided, at 40 PSI, your 275/60r20 tires are rated to carry 2110 pounds each or 4220 for the axle.

So, at 40 psi or more, your rear tires will safely carry what the axle is rated for and then some. This will also provide the most comfort and compliant ride for the truck.

You can also bump up to the max PSI listed on the sidewall of the tire but will not gain any more capacity for the axle and the ride will likely be much harsher.

 

Thanks! I really appreciate your help!

 

I just keep my E rated tires at 35 PSI all the time. That is where I've found the ride and fuel mileage to be acceptable and they will carry more weight than the truck is rated to carry. The 65 PSI stamped on the tires assumes they are mounted on a heavy duty truck with a GVWR 3000-4000 lbs more than an F150's GVWR.

 

Mine right now are at 40 psi, and the front always looks low to me.

 

I had those on an F250, and when I towed, I put pressure to max cold. The theory is to avoid heat build up in the tire...a typical killer of tires. The more internal movement in the tire the more heat. In fact, on all my vehicles I run around 40 psi when unloaded. When I tow I always check tire temps at gas stops to look for something out of the ordinary. Once I found a trailer tire that was much hotter. The pressure was low, turned out it had a slow leak.

 

I ran 50 in trailer tires (as noted on sidewall), and I ran 55 on the KO2's (65 max on sidewall) from FL to TN, and everything seemed to work out great, thanks all!