I think you are all missing the point. The driver was just going too fast for the conditions or maybe had his cruise control on. If you have your cruise control on in heavy rain and the rear wheels start slipping the motor keeps applying more power to try and build speed causing the vehicle to start sliding. I don't think his tow vehicle is too small or trailer too big.<snip> Only the driver will really know what happened.
The last sentence is the wisest thing you posted. Unless and until the driver weighs in, few of us will ever really know.
I've known Ken for several years since first meeting him at a Spring Fever regatta. He is one of the nicest guys you could ever hope to meet. Beyond that, he is no wild man on or off the water. I personally find it hard to believe that he was knowingly driving too fast for conditions or in a reckless or unsafe manner. For all we know, another driver's unsafe actions may have contributed to, or caused the accident. I think we should all be grateful that property damage and possibly soiled shorts were the only damages incurred.
