NOW we are getting honest, real, and not just running up a thread count respones.......THANKS guys.....I have also been running radials on my Airstream and other RV type trailers for a lot of years now.....But this time as I have to buy 5 tires, counting the spare, and yes, it is gonna set for months at a time, I thought I might just consider the bias ply.....ESPECIALLY since in the last lets say 5K miles over the last 3 years I have had 4 blowouts with radial ST trailer tires............YES I WATCH INFLATIONS, BALANCE, how old the tire is, and dont really go much over 60 mph................God bless........Dennis