I have been using a wood pole with cane tips on it to prop up my table while traveling to keep it from rattling. To my dismay, I have found that this didn't really help. I have replaced one dinette chair with an office chair that can be used at my new desk and the dinette. The office chair was really moving around while driving. While under the table, mounting a small nylon pad eye for a strap that hold the chairs in place I found my self looking up at the mounts on the table. I decided the problem was that the main part of the table was just resting on the metal frame.
Here is table top turned over, marked where it rests on the metal frame.
Here I have glued thin strips of neoprene rubber to the table and the metal frame at the end.
I lubed the strips with powder and reinstalled the table. I had loosened the screws in the small stationary end of the table and slipped some strips in between the frame and it, but took out the strip on the front side as it was causing it to still rattle.
I can pound on the table top now and get no rattles. I think I will be able to travel now with out the wood pole, brace.