If you camp enough...you'll figure out how to put things in the galley so that they don't "jump" all over the place when traveling. One thing I always do...I have a patch of painters tape that I use on top of the salt and pepper shakers so if they tip over, it's not all over the place. I"ve never had an upper door pop open while traveling, I use the roller type catches on them.
Rubber "airliner" mat works great, and I just put things in so they are working against each other. I lay the bath towel over the counter edge to keep the slide outs from banging against the hatch just in case as only the cooler has a latch on it. Doug