Originally Posted by vlamgat
I had the same experience as you this month - same position. But I have virtually new E rated Michelin tires. So higher load ratings are not proof against this problem. I had mine inflated to 80 psi but have since established this may be over inflated for the load. My SM B's 8900 lbs with 2 up and half tank of gas and water. So easily 9000 with full tanks. That means my average wheel loading is 2,250 lbs. But the maximum tire loading is 3100 lbs so I only need to inflate to 73% of maximum pressure or 58 psi. Big difference. At least that is the theory but it makes me very uncomfortable to inflate it to less than the admittedly lest robust D rated maximum pressure of 65 psi even though I know that the tire has a different spec.
I am not an expert but I do not agree with (under) inflating tires based on actual load, they need to be inflated to match the load carrying capacity of the vehicle, which is on the tire placard. If you have different than OE sizes, you need to inflate that tire to >= equivalent load carrying capacity of the OE/placard size, see thread in 4x4 forum. viewtopic.php?f=3&t=1582
If the tire at it's max pressure does not meet the OE placard load carrying requirements, then you need a better tire.
Re yes I carry the jack that jage has, I have one in the garage too. I should find out if my leveling blocks create enough clearance. Nice thing is it will work on the frame if you needed to unload the suspension, and it seems to have a layer or two of safety stops.