as long as wisconsin isn't a state that titles boats, a notarized bill of sale, hin check/verification by law enforcement should be what you need. Trailer your just as well off saying it's home and submit a homemade trailer title application which you have to submit with some pics of the trailer, and inspection from law enforcement. I don't know what wisconsin regs are if they title boats or not. I'm from missouri originally I bought my boat I still have from kansas which they didn't title boats so it was a similar amount of legwork to title and register it. Not sure on wisconsin though, if they do title them you might be SOL to do it legally cause then indiana will be expecting to see a wisconsin title. I have bought and sold so much crap in regards to cars, boats, and trailers just PM if you have questions.
why does everything have to get in the way of fishing and hunting?