The industry standard for wheel width VS tread width is 80%. A 235 MM tread width tire has a footprint of 9.25". 80% of that width is 7.40". An 8" wheel is only slightly too wide, so either one will be sufficient. Putting that much rubber on the road without power steering, compared to an original equipment skinny tire is going to give you an upper body workout, no matter which wheel width you choose.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!