[MVR 155]

I towed my Z06 to the track last November on a close to 400 mile round trip on a trailer that weighed more than the car.... total tow weight was in the 6500lbs range. It towed great, you knew the car was back there but I wouldnt say that it was struggling in the least bit. Cruised down the highway at 65-70 mph with no issues and got around 9mpg's

There is no way a 21' boat should make that truck struggle.....do you know anyone else in your area with a H2??? you might want to have them hook to it and see.

On a side note...... check your surge brakes (I would certainly assume this is the set up on your trailer).... if the tounge actuator is sticking and not releasing the brakes completely this could be your issue. You may want to hook up to another trailer and see if your issue persists. One of my friends that I boat with regularly had this same issue. You can try coming to a complete stop and then goose the throttle a bit to kind of yank the trailer, see if this helps, in the end he needed to replace his actuator.

Good Luck