I tried using wally world in greenville once when I was working near it. I wanted them to mount and balence tires I brought them on my cadillac fleetwood winterbeater.
They said they could not do it because the front and rear had to be the same size. I brought them 31/10.50s and 30/9.50s. They did not care that I wanted a 31/10.5Oon my jigalac, only that they be the same size. I asked them if I returned my 30/9.50s for 31s and come back, can they install them? Yes. Even if they rub? Yes. What if I bring you a corvette with staggerd tires from the factory? We can not mount any tires on a car without matched tires front and rear.
I didnt expect much from walmart, thats what I got.
Fyi you can fit 31/10.50/15 on a mid ninties fleetwood with fenderskirts and wire caps no problem. They dont even rub when doing stunts, n stuff.