2012 Ram 2500 wheel weight limit

With GM the trucks can come with either "aluminum" or "forged aluminum" rims and the later will definitely take a greater load. I saw the "aluminum" in a 20" size on trucks and the glove box sticker said not for use with a camper. Easiest to work backwards and max payload ratings for the trucks with a regular cab as that this will be based on one passenger and the load that can be put in the bed of which more than 90% will be carried by the rear rims and tires.

With the Nitto tires I looked at there is a minimum rim width of 7.5" so check that out as well.