Montana Mountaineer RK for three years, have pulled it 20K miles or more.
Yes, you have to be a little careful with things. We don't use 'glassware' but rather difficult to break dishes and glasses. We put a velcro strap through the cabinet handles above the sink. We've not had any particular problems with the refrigerator contents.
Twice, we dumped dishes on the floor before we started using the velcro strap. Those Interstate overpasses can be miserable! If your head hits the ceiling in the truck, you just might have spilled things in the trailer.
All things considered, we still like the rear kitchen. A little modification in approach, and it all works out OK. And we like the floor plan and counter space.