Hauling out of the Miami Boat Show on Tuesday, I had a 32' Boat on the trailer. Got on 95 up to about 55mph trailer started to sway a little, so I backed out of the throttle and it got worse. I hit the brake a little and realized there were no trailer brakes. Holy sh!t, the trailer started to jackknife on me, I started to steer back and forth as the trailer kept going from one side to the other. Finally I got down to about 15-20mph and got everything under control. I've been transporting boats and driving 18 wheelers for 10 years and this is by far the worse thing that has ever happened to me. I felt completely out of control and was extremely lucky to come out of this without any damage to myself, my truck, or anyone else.