Friends, I need your advice..I have a 1994 Toyota pick up. I drive it very little ... It has about 70,000 miles and so here is the question. I had the original set of tires until 3 years ago and replaced them in April of 2010. The manufacture date on the 4 "new" tires is the 12 week of 2010 and the 07 week of 2010.(and probably have 6000 miles on them now)I park the RTV next to it and noticed the rear left tire flat that afternoon where it had been inflated that morning. Get the air tank, air it up and find a vertical crack in the sidewall with air gushing out.... Get in the RTV and go back to work on the farm as the cows need feeding etc.. Now I come in today on the RTV to park and see the same thing with the front -same side.... A closer look show a good bit of "age" cracking on the other two right hand side....I guess I am just up the creek with out a paddle? or what do you think. These tires were $325-Kelly Explorer Plus for 4. Not expensive per say,but an unexpected expense that is discouraging.. collie