I have 98.5 Dodge 3500. With my camper on I have to air up my Michelin tires to
80 psi, max. Having done that, there is only 1/8 inch on inside sidewalls, almost kissing.

There must be after market spacer, or fix for this. Anyone got any answers??

 

Must be some camper. I haul RV's daily, with stock rubber never enough weight to have a problem. Listened to other driver's tell me one size up, no problem. In fact one driver gave me a set of Toyo steers one size up, came with 215 he had 235. I ended up needing new drives, decided to use those Toyo's, get more and do 235's all round. When I replaced those tires all around next time. . .the duals both sides were polished on the facing sides of each set. With spacers. . .maybe. But I'm back on OEM Specs with my rigs. I have enough problems without pooping in my own mess kit.

Cheers,
Steve J