I too am a huge believer in radial tires. My bias ply were way out of round and there are several times in the year that my truck sits idle in my garage. This would create flat spots but having the radials takes this issue away.
My truck handles 200% better and I too have had my truck up to around 85 mph screaming through the Fort McHenry tunnel during the ATHS national show. I would have never made it past 55 on the bias tires.....
