For the portable kitchen, my idea in my next camper is to use a
Partner Stove from Partner Steel Company in Idaho. My concept is to create a cutout in the counter with a regular propane valve that the stove could hook up to and then have a 15' propane hose stored in the propane box to use the stove outside. Best of both worlds. I have also thought about a latch system on the counter instead of a cutout -- pro would be additional counter space that is all flat without the stove in place and then the stove could be latched or secured for travel in rough roads. I have thought about the same for a sink. If you want to save wait, instead of sink just create a cutout in the counter that is the size of a standard camping dish tub. Use a standard water jug with spigot above the dish tub and you have a nice washing/ prepping station that could be moved inside or outside. Also no need for a pump, drains, etc.