I've been storing these 33" super swampers outside for about 5-7 yrs. I finally put the body lift on to accomodate them, got rid of the rust and painted the rims they are on - only to put them on fill them w/air and discover these disturbing cracks along the sidewalls These are Bias ply TSLs with min wear. The markings say 4 ply nylon on the sidewall. The guy at the tire/brake shop told me not to run them, my friend who's a mechanic said they're fine - I don't know? I am sure these have very thick sidewalls. My plans are to use these for wheeling/camping trips. I lke to go 4-6hrs away for such occasions, so i'm sure the tires will get hot espacialy going up in altitude. Then there is the stresses from airing down and flexing them over rocks... Anyone have experience or advice on this? I have 33" BFG Mud terrains for around town, but it's these tires I've been lokng forward to. FYI, the second set is now in the garage. Thanks for the help!