when buying tires from walmart, i always cash-n-carry, then mount and balance here.
unless you have the EXACT vehicle the tire you request is for, they won't mount it for you.
imagine buying say, a 165-80R for the front of your race car that is on the trailer. i think trying that, they would poop their pants ! laugh2
as was said, you could sue wally for BAZILLIONS if something happened ! boogie
beer