Be prepared for grumpy border officials on either side of the border. I have seen them do a total bumper to bumper "strip search" of a MH. Don't know why they were but I was glad it wasn't me. Didn't have anything to hide but that guy was stuck for quite a while for sure. It may have been a random event or perhaps they had reason to be suspicious. Who knows. I haven't crossed over since.
Also check with your insurance companies. Friend of mine's wife broke her ankle in Canada and their health insurance did not cover any of the hospital costs for the emergency room, doctors, xrays etc.