I called Stockton Wheel Service. They can make a wider wheel but it would be by widening the inner edge of the rim. That wouldn't work with the 285/75r16s as it would rub when turning. He said their wheels were also Lug centric which we certainly don't want with a heavier load.
I mentioned that they really need to come up with a standard 8" heavy duty wheel for RVers at least the 3 major brands. He said there wasn't enough business to support their efforts but he would mention it to the engineering department.
He may be right, but I think there are many who would buy them for the safety peace of mind rather than 19.5s. I'm not concerned about my wheels safety but I would like the tire to meet the road more when there is no load on the truck.
I still haven't had time to try the salvage yard for some 16x7s from a 3500. The tire manufacturer recommended 7 to 8.5s. An additional 1/2" will help some
