Just want to rub it in, trailers in Montana are a one time registration. Boats used to be every three years until.... our Governor just changed our registration laws so, we have zero boat registration fees. No more tabs needed period. So, my boat and trailer no longer have any license tabs or fees at all. And the State Budget is balanced. My boat doesn't spend more than 6 months floating in Washington so, im 100% legal keeping it and using it in Washington. My insurance is more expensive because its in Washington. Thats a negative.