My runabout used to be registered in CT. The rule at that time and I think it is the same, is that the boat had to leave the state after a 30 day period in order to maintain the registration. I have for at least the last 10 years reg. it in NH. mainly because the boat stays in NH. Pontoon boat does not have a trailer, but shore would like one for a 24' one. Hint Hint.