Can't help on the wheel cut,but it is what it is. Regarding tires, when we had a 1999 36B Pace Arrow Vision and it was time to replace the Michelin's I went with Kumho based on a recommendation from a neighbor that used them. I had great service from them, a bit harder riding than the Michelin's, but acceptable and a whole lot cheaper. When you start tweaking things on your new toy, I suggest looking at putting on front and rear trac bars. Also look at the sway bar bushings, they tend to rot out quickly, an easy fix, look on Ebay and polyurethane replacements. They will last as long as you own it
Also , check out the shocks, if they are original, replace them with Monroe ( NAPA) it will make a world of difference.
Joe
2013 Dutch Star 4338- all electric
Toad is 2015 F-150 with bikes,kayaks and Harley aboard