They all do it. Lots of 'C' behind the rear wheels. But a rear kitchen has a lot more stuff that can fall. Mine is a rear BR. When I first started, everything on a hangar in the closet was on the floor when I stopped for the night. I finally bought a spring loaded drapery rod that I put over the top of the hangar hooks before driving. Not much to fall, anyway. I don't put jeans and T Shirts on hangars to begin with. I do the same thing for the shelves in the bathroom medicine chest.
In your case with a rear kitchen, you just have to put everything in a drawer before driving. If stuff rattles, go to Home Depot, Lowe's or an auto supply shop and buy a bundle of orange rags like mechanics use to wipe their hands and stuff them into the open spaces. Cheap, and easy to find and remove when you stop for the night.