Louiehenry, You might want to find Jim Villers thread on overside rims. He was running CLK spoked 15" rims and 205 tires when he was returning from PUB back in 2009. Good thing that I was following him, we were on the interstate highway, doing around 70 MPH in the mountains of West Virginia, and he had a blowout on the right rear tire. I started putting on brakes to notify those cars behind us to slow down. Jim was able to pull off the highway safely. Anyway, it seems he had a passenger riding with him which added additional weight to the rear springs, and that this helped the tire rub the tailpipe all the way over to Blacklick and halfway back and the heat of the tail pipe rubbed a hole in the tire. He had this thought that to increase gas milage, and that his 15" tires were in better condition, so he would put on the 15" wheels just before he left for Blacklick from Virginia.
Bottom line, just make sure you have enough clearance between tire and inside tail pipe with additional weight on passenger side.
Bob