Selling to out of state
I am no attorney but I assume you sold the boat where is as is?? I would hope you are not responsible for readying the boat or loading the boat or trailing the boat to its new home. If you are I would think you should not be or make sure you are insured up the @##$%^. I am the trusting kind and get myself into all kinds of trouble so when I say, I can see a whole kettle of fish developing if you are responsible. You know even I would be concerned.
In any case before the boat gets ready to ship or on a truck you should have your nonrefundable money in hand. You can give the title to the truck driver to give it to the new owner on the other end.
Just my thoughts.