Originally Posted by Ela1948
The reason that the placard said 65 lb. is that the front axle doesn't carry near the weight that the rear carries and they want it the coach to be a softer ride. It probably is just fine going with 65 lb. Your tire guy is erring on the side of caution. He is giving you a slightly harsher ride to be certain that you are not going to build heat or overload your tire. I tend to do the same.
Keep the front tires inflated between 65 & 80psi and the rears at 80psi and you'll be fine.
If you experiment, you'll probably find a pressure for the fronts between 65 & 80 that gives good handling with a less 'harsh' road feel. For my class B it was 65psi and it's 70psi for my TV.
(All this is assuming, of course, that the tires on your class C are the correct load range and size as original equipment. When I bought my class B, the prior owner had cheap, passenger car tires installed!
Sherm & Terry w/rescues Steve (std Poodle) & Eydie (min Schnauzer)
2015 Jay Flight 27RLS (Camped: 102 nights 2015, 90 nights 2016)
2006 Ford F350 6.0 PSD, Lariat, 4WD, CC, LB, SRW, auto., Camper pkg.