Hutch nailed it about the gas pressure if you want to use the tap on the side of the camper. The stove or BBQ needs to runs on 11Ē water column WC low pressure propane gas if you want to use that tap.
Most of the gas grills you see in the store that run off of the little green gas bottles are actually high pressure stoves. Like 7 or 10 psi.
However, to help you and Hutch out, see this web site: Vitco stoves
Vitco makes the RVQ and the RVQ II. And you can buy direct on line if you want.
You need a shut off and a LP gas rated quick disconnect. They actually make a gas quick disconnect with the shut off all in one. I canít put my fingers on one this minute but here are the just the quick disconnect only part. Marshal Brass
or this one Mr Heater at Ace hardware
However both of them do not have the little shut off on the side of the female quick disconnect part. That little shut off letís you for sure shut off the gas. Donít use compressed air rated quick couplings. They are not gas rated. I do not know for sure that the shutoff is law, but it is a good idea.
Now for Hutch:
Vitco also has 2 and 3 burner stoves with the fold down cover that are porcelain stoves. Victo makes stove tops for a number of camper builders. The stoves are rated at 6,500 btuís which sounds like low pressure gas. Would have to call them to know for sure.
I went thru this a few years ago too. I had a Coleman PU that had a 2 burner outside stove that ran on high pressure. This was unique to Coleman and was a nice stove. Up front by the gas bottles, they had a tank to high pressure regulator, a tee in it then the low pressure regulator for inside propane use. Inside stove, furnace, and HW heater used the low pressure as required by law. They taped into the high pressure tee to pipe to the outside high pressure stove.
I traded the stove with the PU when we got the TT. Wish I never did. Thought I would just buy a new one. Well I went to Coleman and asked. $365. I said NO. They really love there neat little stove.
On the Vitco I sent you to you will have to make up a box to house the cook top like the Starcraft and others do.
For me I ended up using a 10,000 btu high pressure all stainless outdoor stove run on my 5# gas bottle. It was cheaper to buy the bottle then to install all the right rated gas fittings and regulators off the main tanks. And itís portable. The dual change over regulators made it complex to do like Coleman did.
If you want to boil water, even my 10,000 btu one will take Ĺ hour for about 1 Ĺ gallons for washing dishes outside. For cooking, well the 6,500 btu one will burn up your frying pan just as well as the 10,000 one. But boiling a gallon or more of water with the 6,500 one, well be prepared for a long wait. A coffee pot, well it will work. Most likely your master burner inside your camper is 6,500 btu rated so you know how good it is or not.
Iím in the process now of making a mounting rail and top for my outside stove to attach to the rail on the camper just to hold it level. You can buy the mating rail at a RV dealer. If wanted Iíll take picís when done. May do this weekend if weather cooperates.
Hope this helps
PS If you really want a outdoor cooking machine see
They do also have 11" =WC units and high pressure and they have 25,000 to 30,000 btu burners. You can have a clam bake to a sweet corn fest. We have these in our Boy Scout troop for big gatherings. No problem boiling water or turning them down to cook pancakes. Only problem in the TT is the weight.