Sorry to hear you had problems, we have had good luck with Titan tires, my front tires lasted 7 years and I replaced them due to worn tread. We had a set of Good Year tires go bad a few years ago. My wife just had a set of Good Year car tires replaced that wore out prematurely and the dealer covered over half the replacement cost. I guess sometimes you get a bad set.
Just in case some may not know, Titan makes Good Year ag tires. Have for some years now.
Also over on New Ag Talk you can find post about Titan tires and one Titan rep. post replies there. The OP may be able to contact that guy and get some help as well.