15 x 7" wheels. Can these tires fit? Or too wide to seat bead amd also get good tire wear? Or will they be too rounded?

 

they would fit fine on the wheels, there're lots of guys running 12.5 wide tires on 15x7 wheels.

 

I have the 32/11.5 on the stock zr2 wheels, and they are rounded slightly. Work great aired down, but at 32psi the edges pull up a little. Would I run 11.5s again, absolutely. I don't think I would run 12.5s unless the truck goes offroad and gets aired down a lot.