I'm not the owner of this nice-looking trailer, but, being a US citizen who bought a Canadian trailer, I just have a few things to mention:
1) Canadians don't have titles, in the exact same way we have them; they have "ownership." It works similarly, but is not exactly the same.
2) Being a non-motorized vehicle that is over 25 years old, and because of NAFTA, you should have no issue with Customs coming across the border, and no additional expense.
3) The thing to look at carefully, is what your state requires of an "imported trailer." Each state is different, and range from (apparently) states that don't give a fig, to states that have a lengthy list of requirements (not that they are hard to satisfy, but you want to know what they are before you go to pick up the trailer; for example my state wanted several items, including two specific Homeland Security forms filled out at a point of importation - of which the border is one).
I have posted about this in more detail in a couple of other threads, but basically it boils down to finding out what your state's requirements are so that you can make sure to fulfill them. Not necessarily difficult, but there are details that may be easy to accomplish if you know about them in advance, but difficult/frustrating if you don't find out about them until you are home with your new pride and joy.