This my truck=I have a 2003 Chevy Silverado LTZ 1500 HD Crew Cab, 4x4, QuadraSteer (4 wheel steering) 6 Lt Engine. A/T, with 4.11 gearing. HydroBoost Brakes, 6” Lift by ProComp, 17” Hummer 8 Lug wheels, Firestone Airbags. Dual Engine Batteries. Electric Engine Fan. Buckstop front bumper with Warn winch. 6.5ft bed. The Q/S Chevy Bed is 7ft wide, and the NorthStar Camper is also 7ft wide, It should handle the weight easily in the power to weight with GVWR 8600 lbs. Truck was purchased new in 2003.
It appears your 3500 truck has tires and wheel update. =brian