just go to your DMV
Boat- transfer title to you and buy 3 year sticker if it has expired. It helps to have serial munber and the reg # that are on the boat sometimes.
Trailer- if there is a title bring it, otherwise there should be a lic sticker on the tongue. There is brobly a stamp or plate somewhere on the frame that has info on it from the mfgr as well, that can sometimes help to have. If worst comes to worst and they are “typical” DMV workers and there are problems with the transfer of the trailer (i had it once). St.Cloud tried to make me jump through all sorts of hoops, I said screw it. Then a few years later I built a trailer and went to Waconia,MN DMV to attempt to get it licinced. Let me tell you these ladies know their biz, It was so easy, just write a dscription and pay $55 and BOOM, Licinced trailer. I now do all my DMV stuff there!!!
So, if you do run into a lot of hastle just say it is homebuilt . -Mark