Late too and didn't see what the wheel width was 8", 10"? If you're not having contact on the outer edges I'm thinking the rim may be too narrow (too much air can also be the culprit, but not 12/14lbs). My 10.5 M/Ts are on a 10" wheel, which in my thinking puts the bead in, or close, the vertical plane of the outer edges of the tire...Just a different POV, RodC.