Tony,
For your intended purpose, cruiser/camper, I think the tires/rims you have chosen will look and perform well...if they fit. I installed a 77 Ford two-speed rearend in my truck.
I mounted 8.25-20's on rims that matched the stock ten bolt ones in front.
My recollection is that most motorhomes have front rims with quite a healthy offset.
I am sure there are aftermarket rims available with different offsets.

Atomarc.