How much air in the tires? Need advice... First "real haul"

Damn, Sleepy could close this thread! I agree, so many reasons to use max pressure for heat,capacity, sway control,all related to tire safety and life,( incuding yours). If you see the tires wear in the middle more than the outside edges, lower the pressure.
Seriously, with that kind of weight we carry, the max is usually the best.
My camper dry rates at 2200 lbs. The scales put me at 3000lbs. You really do have some weight on there,,happy travels!!!!!!