I've had blowouts with the 8" trailer tires (that used to be standard equipment on that style of trailer). Switched to the 12" tires, end of problem. One note: there are different widths and load ratings of 12" tires. I use the 5.30x12 load range "C" tires - the highest load rating I could find.
Common sense has to prevail regarding the speed you go on the highway, though. 120 seems to be fine.
Common sense has to prevail regarding the speed you go on the highway, though. 120 seems to be fine.