The rating is the easy half of the answer. A trailer never weighs its brochure dry weight (water is 8.34 lb a gallon, propane and batteries ride along, and so does your gear), and hundreds of models changed their published weights mid-run, so the model year decides as much as the model. Judged that way, with a 10% margin and 2 people aboard: 4966 of 5150 campers fit a Chevrolet Silverado / GMC Sierra 2500HD (Duramax), and 13 more fit if you buy the right years.
The number that quietly binds is payload, 3,544 lb (2500HD Regular Cab Long Bed 2WD, Duramax 6.6L, 17" wheels, GVWR 10,550 lb — the exact row Chevrolet rates at 18,510 lb. Crew/Double Cab and 4x4 rows fall to roughly 3,375-3,657 lb.): tongue weight lands on the rear axle with your passengers and the hitch, so a vehicle often runs out of payload well before it runs out of rating.
Loaded estimate: dry weight + full fresh tank + propane, battery and gear for 2. Headroom is against the rating less 10%.
FIT IF YOU BUY THE RIGHT YEARS
These changed their published weights mid-run: some model years clear a Chevrolet Silverado / GMC Sierra 2500HD (Duramax), others don't. A listing site treats them as one trailer. They aren't.
That depends on what you care about: bunks for the kids, build quality, budget, weight you'd rather not tow. Set your priorities as sliders and watch all of these re-rank around them, live, with your vehicle already filled in. Nothing gets hidden.