I had a similar situation with a boat and trailer I had in Canada and wanted to import into the US. (I have some property in Canada and used the boat up there for a few years before bringing it back to Seattle.) You have 3 issuses 1. Importing the camper into the US. With NAFTA if its made in Canada,other than verifing it meets US DOT specs (if campers have to meet specs?) that's not a major issue. 2. The Washington State Patrol inspecting it to verify it has a VIN and it's not altered and its not stolen. 3. The statd DOL issuing you a title and license plate. With my boat and trailer, long story short, they were only concerned that the trailer met US DOT specs. I don't know if a camper has to meet DOT specs, if it does need to meet US DOT specs generally speaking Canadian MOT specs are stricter and so if it meets those it just needs somebody to certify it, and the camper manufacturer will either be able to do that or refer you to a company that will do it for a fee.