Had my first blowout with 2 yr old Towmaster's LRE (15" rims). Took out my fender skirt but didn't do too much damage otherwise. Replaced all 4 with the same as it was the only tire available. Funny thing is, I picked a remaining tire to use as a spare and it popped just sitting along side my house.
Had 2 Maxxis LRE's with sidewall separation issues (within miles of each other) and they were also around the two year old mark. Discount replaced all 4 under warranty (remaining 2 were looking bad).
I have been weighed and know I'm only putting about 1975 lbs on each tire. I also run a PressurePro and keep the tires inflated to max pressure. Had my axle alignment checked and they were fine.
Switched to LT's and keeping my fingers crossed.
Good luck,