loaf as others have said do the car too. you have IIRC 90 days to register it for "free" then they make you pay taxes and get the car inspected.
i maybe wrong but i have heard the above before, being i am from this dam state i dont know for sure how it works
also on the tax on the boat they go off of the noterized bill of sale, which must include sellers names and sigs, the date and the price. make sure you put the hull number on the bill of sale. the price on the bill of sale is what you will pay 5% tax on. if the bill of sale says 2 grand you will pay a 100 bucks... get it