Years back, I had a Jeep Wrangler Rubicon Unlimited that came from the factory with LT Load Range E tires. Recommended inflation pressure, according to the door jamb sticker? 33 PSI! No way would I ever be crazy enough to inflate to the 80 PSI pressure stated on the sidewall for Max Load!
I made several trips of 1500 miles or more, at 70 MPH in that Jeep. Never had a tire problem.
I spent some time off-roading that Jeep at 5 MPH (or less), with the tires deflated to 12 PSI. No tire problems.
When I bought new tires for the rear of the motorhome, Load Range F tires were not available, I had to buy Load Range G. I told the tire guy to inflate to the LR F specs on the data plate. He argued, but eventually did it my way. No tire problems. They are about to age-out, so I will have to replace them soon. I'm sure we will have the same argument, and he will do it my way again.
I find it interesting that after all the mental gymnastics and number crunching, the OP came up with the same tire pressure as that stated on the data plate, or perhaps a little more, depending on the source. I certainly got a chuckle out of the 80% of rated pressure for LT tires, when Jeep recommended 33 PSI for LT LR E on the Wrangler Rubicon!
Oh, well, it was on the internet, so it MUST be correct, right?
