I've got a set of 10 ply wrangler duratracs, the sidewall says no more then 80 psi, I just want to get the most out of the tires and was wondering if anyone knows what a good pressure to run them at to get the longest life out of them. I have a LBZ 2500hd, the last time I had it on the scale it weighed 7100 lbs and I usually carry about 1000-1500 lbs in the bed. They're at 65 psi now and you can see they're just barely starting to squat. Thanks.