Maybe some of you on the list remember the problem I had last summer with my centerboard pin vibrating almost out. I have since related this to the severe vibration caused by the bias ply tires I had on my trailer. Since I moved to radials, the ride has been completely smoothed out. When I first noticed the vibration, I thought the wheels on the truck were out of alignment and took it in and had them balanced. First time I towed the trailer after that, I thought I had a flat tire it was so bad. Once I changed out the tires on the trailer, it was like magic. If I ever buy another trailer, it will have radials from the beginning. Time for a cool change! Sandra(Seawitch #617)