Weights and capacities - Sierra 2500HD D/A

Just make sure you don't exceed the rear tire capacity. Biggest challenge will be determining what the loaded pin weight will be in order to stay under the tire capacity. Many people like to throw out simple guidelines, like 25% of the fivers GVWR, for loaded pin weight. And they are a decent starting place, but there are a lot more variables. Some fivers have a lot more Carrying Capacity than even a full timer can use. Rear kitchen models generally have lower dry pin weight as a percentage of total dry weight and also more wet weight behind the axles.

As a pilot, you probably can do a good job at estimating how much cargo you will carry. Be aware that most storage is located forward with a fiver so that while the dry pin weight might be 15% of the total dry weight, the maybe 1500 lbs of cargo you add to the fiver may have 40% of that weight show up as pin weight. Make your best calculations and pick a fiver that should give you some margin on tow vehicle tire loading.

For reference my previous 2500 HD towed a fiver with a dry pin weight of 1900 lbs, but it also carried a utility bed that weighted 400 lbs more than the stock bed plus a replacement 45 gal fuel tank.