The Sticker On the vehicle should coincide with the tire on the vehicle as purchased. But that is a go by and does not take into consideration the weight difference corner to corner and overall. If you are not going to weigh the corners or the axle then the recommendation should be to inflate the tires to the maximum that is listed on the sidewall of the tire and not the coach. I would imagine that this is more than needed but it becomes the safety factor when not knowing the true weight. My suggestion would be to take your MH to a scale and if they do not offer corner weighing then get it weighed by pulling the front axle onto the scale ask them to get that weight and then pull the whole unit up and get an overall weight by subtracting the front from the overall it gives you a pretty fair starting point. Go to the tire website and find the pressure for the tire at the weight you are seeing then add 5lbs as a safety. I would rather see you with a little bit of a stiff ride as to see you take out the fender wells and area surrounding with a blow out.