I imported a boat from Canada to the US. (bought it in Gibsons). Biggest thing is it needs to say "Meets US DOT Standards" on the VIN tag. Depending on manufacturer, it probably does. When I imported my boat, they never even looked at the boat at the border, they were only interested in the boat trailer. If you get the deal done before Trump repeals NAFTA, assuming it was made in US, Canada or Mexico, there's no duty. You need a letter stating that any recalls have been done. The state where its being licensed will run a VIN check to verify its not stolen.
2014 F 250 Gasser
2019 Outdoors RV 21RD
"one life, don't blow it", Kona Brewing
"If people concentrated on the really important things in life there'd be a shortage of fishing poles" Doug Larson