it would appear the purchaser needs to show up with enough money to pay you and the bank off. Then he can transport it with title in hand to the border, pay the gst and pst. Then take to trailer to the correct places to have it approved to be insured and towed on road sin BC. The bill of sale should have the trailer price separate from the boat for tax purposes. I purchased an Alumaweld a few years ago in washington and had no problems at all bringing it across the border.