Update: Interesting that no-one else has had this issue. It was not so much turning too quickly, but when the MotorHome rocked sided to side that the drawers would slide open.
Here is what I did to fix:
No need to remove the drawer / counter assembly to do this.
From the cabinet next to the drawer set, I drilled a 13/32" hole through the wall faces and the side of the cabinet. Just at the level of one of the drawer slides.
Open the assembly, and open the hole to 1/2".
Mount a furniture leg plate
https://www.amazon.com/gp/product/B0...0?ie=UTF8&th=1
Now, when traveling, screw in a 10mm dia x 75mm screw from the cabinet into the assembly.
Note: I did have some binding, so I opened the main hole to 7/16".
See attached pics for details.