So, you can't make this stuff up...... My new 21RBSS sitting in my driveway with literally only 1,200 miles on it blew a tire out just sitting there. I'm as anal as they come about maintenance and up-keep, and my tire pressure was just checked and set at 60psi (they were almost there anyway) because we had very cold weather coming. Apparently this isn't uncommon when dealing with campers for this to happen. The junk Castle Rock ST tires are obviously defective, however they're only going to authorize replacing 1 tire. Whose to say the other 3 won't do the same thing driving down the road. So talking to many people I know who fulltime or travel 10K miles a year, they said to replace them with LT truck tires. The number 1 recommended tire for 14" was the Hankook Vantra LT 195/70R14 106R D1. The tire is specifically made for cargo vans and light duty trucks that haul heavy loads. Best thing about it, you get 12/32 tread vs 7/32 tread of a standard trailer tire. Speed rated to 106mph, max load capacity per tire 2,094 lbs. I'm gonna bite the bullet and replace all 4 of my tires with these.