When I bought my truck the Mall Terrains had over 90% tread on them, but they were 10 years old (that would be 10 years in the South Texas sun). Slight cracking in the sidewalls leads to larger cracks, which leads to finding out that your stock jack doesn't work. At least I found out at home. So, I replaced the the front two tires with Dunlop Radial Mud Rover 32-1150R-15 and I bought a new 48" hi-lift jack today. I will now spend the next week or so burning the back two tires off. I know it is irresponsible and I am sorry.