Help needed on wheels

[Greg]

I own a 1965 Chinook Motorhome based on a Dodge 1 ton chassis. It currently has 16 inch 6 bolt split rim wheels with duals in the rear. I would like to change to 16 inch tubeless 8 bolt wheels. Can someone suggest how this can be accomplished easily and without a huge cost? What brake drums should I use or? My goal is to utilize 235/245 tires. Greg. GMcCriterion@aol.com