Sharkey, I tried that "flooring it" once - it almost killed me! I was trailering my Dad's pontoon boat to Havasu with my 1/2 to Suburban. Around 65mph on the freeway the thing started fishtailing. Remembering my brother-in-laws advice (same as yours) I accelerated, but it only got worst. Eventually I had to use the brakes. As I got down to around 50mph it straightened out. Scarred the hell out of me and it was lucky the freeway wasn't busy. That was two years ago, I had been trailering boats about five years at the point, and I never saw anything close before or since. Turned out I was negative tongue weighted and had to proceed at 55mph the entire trip. That was the only time it happened to me, do any of you have experiences fishtailing? What did you try and how did it work?