Tire Bulge problems of the 2002 Ford E-350

I have a 2002 e350 Ford ext sd van that came with oem goodyear wrangler ht lre 245/75r/16 tires. The veh was obtained new in June 2002. Since new the tires sidewalls were cracked and dry, after driving on them a while the sidewalls had minor bulges, and more cracks. The tires were rotated/bal/and proper psi at all times and were never overloaded. The tires were replaced with michelin ltx/ms at 33k miles. These tires should have been replaced under a "safety improvement campaign" by goodyear at their expense (NHTSA campaign id nr 02x001000 dtd 28 Jan 2002). I was not notified and the "campaign" expired, leaving me to replace the tires at my expense. By not notifing me goodyear saved a bundle but it left me in danger of a possible blowout/tread seperation or even a crash. When I did find out about the replacement campaign I went to my local goodyear dealer and all they offered was to sell me the same tire at an inflated price compared to sam's club or wal-mart. Needless to say I will not be shopping for goodyear tires in the future.