Wonder if anyone can help... This summer we are planning to fly to Boston, hire a car and make our way up to my Uncle's house in Canada via. Bar Harbour. We would then like to return back to Boston with this car. Will it be possible to take a US hire car into Canada and back or will it be a massive pain/impossible. One uncle says fine, t'other says don't do it. There are always different ways around it of course but this seems like the easiest. Has anyone done this? Thanks.