> I know it happens but I don't think it happens often enough to make for a viable product offering
Agree, although apparently it is a not uncommon problem on quarry hauling trucks, etc. It just depends on the environment in which you drive.
No incentive for tire companies to sell such a product. It's just an unusual niche. Even tire valve extenders, which arguably affect every user of duals, are an underserved market.
> Foam ring
Yes I agree. Might try this at some point
> Spacer
Seems like that would be a significant change to lug stud lengths and overall wheel geometry.
