There was a post over on the nautique forum about someone who ran into this guys at the ramp. I'll go dig up the post
... He pulled the boat out without tieing it down. The ramp he loaded out in is fairly flat, because they use this same ramp to put in house boats and massive cruisers on Toona.
After leaving, the same bump and what not, slide the boat back on the trailer. Sure, he could have made it 10 miles down the road before this happened. So maybe at this red light, she was way back on the trailer and when he took off, she slide off.
I say this because he left his top on the platform along with all their towels while he was putting the boat in. I stopped him and told him about it... There were two girls and another guy in the boat. Maybe he just wasn't paying enough attention... or the beer kicked in.