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: 5138 of 5150 campers fit a Chevrolet Silverado / GMC Sierra 2500HD (Duramax, max tow).
Loaded estimate: dry weight + full fresh tank + propane, battery and gear for 2. Headroom is against the rating less 10%.
THE HONEST SUMMARY
Fit, loaded, all years5138
Fit certain model years0
Too heavy loaded12
5138 fit. Which one is right for you?
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.