Well I hit the scale today. Full of fuel I was 4200 front, 2980 rear and 7180 total. So if I say my empty rear weight is 3000 and my camper loaded for camping with water and propane is 4,500 my total is 7,500. 90% of my trips will be empty water so save 400 which has me down to 7,100. Would a nitto terra grappler at 3980 in a 285/75/16 not give me roughly 900lbs of wiggle room? The guy at les Schwab says I can fit a 245/70 19.5 without any front mods...? I'm hearing a 225 is the max for most Chevys. I was quoted $2,900 out the door with toyo m608z in 245 with the vision wheels (4). The 225 would give the same as the 285/75/16 as far as weight capacity goes at a lower price point. I just don't want to spend $3k to be hamstrung to the highway (19.5), when a 285 would work.