I had a same 2nd gen '01 2500 Cummins/47RE 3.54 gears 2wd truck. I really liked that truck but having only one ear hearing left and the other getting bad I had to let it go. I sold it and bought the new just out 3rd '03 Cummins HPCR 2500 truck much much more quieter engine.
The rear suspension on the 2nd gen Dodge trucks still had a upper over load spring pack. I pull heavy GN and 5th wheel trailers. Even with a 18k 34' flatdeck which was loaded to keep the truck w/i its 6084 RAWR. RAWR = the lessor of a wheel....tire....or rear spring pack. No rear squat.
I bought the truck new and sold it with around 85000 miles. The only problem was the 47RE would take sometimes off in 2nd gear (no 1st gear)......so control valve body had to replaced at 4800 miles under warranty. No issues after that.
The trucks chassis/suspension and drive train will be fine with that sized truck camper.
Having pulled heavy and light trailers and owning three different size truck campers up to 10' 6" length I've found pulling trailers is much more harder on a trucks drive train than carrying a TC around.
LOL...if you can stand the racket that '99 was a tough truck.