I don't know what Walmart sells, but Sailun tires are very popular with the commercial trucking crowd and with full-timers on the other forums I'm on (mostly towables since that's the crowd I run with). I've not read of a Sailun failure on any of the forums. We ran the Sailun S637 load range G ST tires on our previous fifth wheel for 30,000 miles without a single issue. I just had the OEM tires removed from our new fifth wheel and replaced with the same Sailun S637 LRG ST tires. It's peace of mind for me.
Rob