Importing is fairly easy if it is 25 or more years old. Those less than that run into a few complication having to do with them being US DOT certified or not. There is a good write up on this at the site <<<fiberglass-rv-4sale.com>>> as well as a number of US and Canadian listings of FGRV's for sale
Did you have an existing trailer that's for sale
in Canada in mind. Tell us the make and year and you should get some suggestions.
Also search this site for "Importing" as there were several recent discussions that will help.