I just put new tires on my 5th wheel yesterday. The old Goodyear Marathons called for 35psi cold max pressure. The new tires call for 50psi cold max pressure. When I picked up the tires yesterday after having them mounted, I asked the guy who mounted them if he put 50psi in the tires. He told me that he put 35psi and that you should never put the max pressure during the hot summer, because the tires will build pressure while on the road and could possibly blow out. When I got them home and put them on the 5th wheel they do look a slight bit baggy but its really hard to tell for sure. The tag on my 5th wheel says to run 35psi, but that was with the Goodyears that I am almost certain came on the trailer from the factory, and their max pressure was 35psi cold. Should I leave them at 35psi or should I increase the pressure (and by how much)?