After driving around in a bus for a bit, my votes with Kyle! If you have enough vibration to break a household refrigerator line, there is something very wrong with your suspension.
I think one of the first things I noticed in the bus compared to a S&S was objects not moving all over. Items left on counter tops were mostly still were I left them the next time I stopped. Not a good idea to leave things out, but happens.
Same with items in refrigerator I only recall a coupe of times when something fell out of fridge when I opened the door, that's without securing anything. Just took some thoughtful arrangement of items on shelves. With the S&S I needed a can of caulk and foam