I have imported a couple of boats from washington state,without any problems or hassels from BSA.The trick is having all the paperwork ! I always print off the ad ,craigslist ,ebay, yachtworld etc,makes crossing the border easy ,showing the BSA agent the ad.As mentioned in other replys to this thread, Bills of sale,Titles,registrations, hand written bill of sale if possible,all signed and dated.The boats are very straight forward,the trailers have to have visable serial numbers,matching the paperwork,home built trailers without a manufacture sticker ,are asking for problems,manufacturing stickers that are,unreadable or ripped off ,more problems.I get the seller to take a pic of the vin sticker on the trailer ,and email it to me ,with any pics of the boat(good for extra paper work at the border)Anybody I have heard having a problem xing the border,has been with "fudging" the price of the boat .Putting 3 or 4 names on any document xing the border,might create a problem,getting thru the xing,fiqure that mess out when back in canada !!