On my coach the tire manufactures manual and Winnebagos manual said to run my Michelin Tires at 75 psi rear and 90 psi front. This did not work for me. I was getting rear tire squirm at 75 psi in the rear tires. What I did was experiment with air pressure in the tires every time I went RVing. I settled on 100 lbs. psi all around! It must of worked because I got 10 years out of that set of tires and two years on my new set of tires at the fore mentioned lbs. psi. And your absolutely right in saying low tire pressure is dangerous. The lower the tire pressure the more heat build up you will have inside your tires.