i'm not fortunate enough to have an enclosed trailer but a fellow racer i know has & he has what looks like the spare wheel holders off the back of an SUV on his walls for mounting spare slicks on. i know he uses those plastic coolroom bolts to mount the fixure onto the wall as they're slim & don't ever rust & they're strong (they have to be, you ever see the size of the cooler assembly in a big chiller?)