I have a portable gas grill, its called a grill 2 go but there are other brands that make similar. Since its a regular grill and not a campstove it is disguised rather well, you can say you use it for tailgate parties at the game (which is what it was designed for anyway) and no one will ever know.
Mine runs off of 1lb propane and I have an adapter hose to connect to the 20lb ones. 1lb of propane will last 6-8 meals for my wife and I or cooking a large meal for about 100 people (once it gets up to temp, you can turn the flame all the way down and it still stays at cooking temp so its very efficient) for family reunions. We throw it in the truck a couple time a year, stop at same and pick up some big packs of hamburger and go to the park cook for the whole (big) family.