Just a couple of comments. First, I notice that our RV policy has wording that says something the the effect that "the RV is normally located at...", storing it in the US (for extended periods) would probably void the insurance, check your insurance fine print!
Second, on our border crossings into the US I note that the border officer has deliberately gone to the rear of our 5th wheel to write down the license plate number(because the camera wouldn't catch it) and enter it into the computer. Tells me that there would be a follow up if it didn't return now that the countries computers talk to each other.