I finally found the cure for rattling dishes while driving on bumpy roads. We normally use sheets of packing foam to separate dishes, cups, etc. and when we go to use them we have to stow the sheets someplace until we're ready to go. I thought about this and wondered if large rubber bands would keep things quiet. So I did some searching on Amazon and found these silicon rubber bands:
https://smile.amazon.com/gp/product/...?ie=UTF8&psc=1 These work great!
Below are pictures of our dishes now. The largest bands could be used for pots and pans (I used one on our crock pot lid) but the most versatile are the 6" and 9" sizes. An added benefit is that the silicon doesn't slide on the cabinet surface, so the dishes stay put.