Weight of the camper should not be an issue on the dually truck. Each E rated tire at 80 lbs cold should handle over 3000 pounds each for 12K. Hence the GVWR of the dually truck. Weighing the truck empty and with the camper loaded for each axel is important. Highly recommend!
On my setup with my lance 10 ft. 95% is on the rear axel and only a measly 5% on the front. I had separation problems for several years (fortunately never blew one always a rear tire) and finally found my air pressure gauge was off reading high by 4 LBS. Replaced that and bought a good one. Since then no problems. I have single rear wheel drive which means my margin is small. Potholes, speed, and ambient air temperature play a big part on tire temperature as well. Always experienced the separation on a hot afternoon or rough pavement (which is the norm in Cali) The shock of hitting potholes can easily cause separation when loaded. I drive at about 60 mph and have been running Hankook Dynapro HTs for the last 7 years.
Just replaced two front after 6.5 years due to cracking on the sidewalls. In a sunny hot environment like Florida and the southwest the sun does take a toll. Garaging should help that though. Rear axel weight empty on my dodge 2500 is only2540 and with my camper is 5840. obviously I run 80 in the rear but only 50 in the front when loaded. Air bags level the Truck with camper and I have auxiliary load leaf springs well just touching the stop. Handles well.
Tires are the weak link for us truck camper people! Use a couple different air guages to verify.