I've been running the "Carlisle" "Sure Trail" load range "D" bias-ply, 7.00-15 tires for 3 years with many trips up and down the east coast with no trouble (knock on wood). I use to run the Marathon, after having them blow out 3 times, I'll stick to my old bias-ply. Paul Waddell WBCCI/VAC/WDCU 1270 66 Overlander 66 Safari 70 Safari