I have a Ram 3500 with a Bundutec Flatbed Camper that weighs just over 2000 pounds. I have consistently run Cooper AT3's that are 10 ply with a load rating of 3640 pounds. They last a long time (50k plus) and arent noisy as they wear like BF Goodrich's. I have upgraded the shocks and added a leaf but thats the only changes I've made. On highways, I typically run 55 front and 75 rear and on trails drop that to 30 front and 40-50 rear.