I take it you didn't keep the original box it came in? Then I would pack it in the car.
FYI. When I bought my Janome, I was told if there was ever a problem with it that required the dealer shipping it to the manufacturer, the only way they would ship it was if it was in the original box. They would not take any substitute. Kind of a pain to store a large box for years "just in case", but better safe than sorry.