One last comment, the scale may show that you are carrying less than the max on the front axle, and maybe 50 psi is OK, or you may be heavier and find that 60 is better.
The door sticker for my Suburban when loaded is recommended at 50F/80R. Obviously 80 rear for max load capabiltiies. I upgraded from the stock 245/75-16 to 265/75-16 on wider rims, and I find that 60 psi in the front gives me the best handling and ride combination. It took me a while to get it dialed in, 50 was too soft for the bigger tires and 65 was like it had no springs LOL, so 60 seems to be the sweet spot.
Your rig obviously will be different...you never want to be below what the tire mfr specs for the load on the axle, but waaay over is no good either.
I would start 55F/80R with the camper on take it to a scale and see what you've got. If not happy with the ride/handling, some adjustment may be in order.
Happy camping, and always set tire pressures cold! :B