For 25 years or more we've carried a small tank that looks like a pint-size version of a standard home BBQ one. In a pinch, we've used it to fire a radiant heater. It doesn't take up much room in a bay, is probably about 2 gallons (5-8 lbs), and I can't remember the last time I filled it - certainly many years ago. It's convenient because I configured a "T" of brass piping for it, with one outlet at the very top of a 3 foot pipe, and two or three outlets at the bottom, where it connects to the tank head.
I usually just use a 16 oz. toss-away tank for the Weber BBQ, but never relished the consequences of the tank running dry half way through a steak. For larger operations, the bigger tank sits in the middle of a campsite picnic table with the "T" on it, and a special coleman lantern screwed to the top of the 3 ft. pipe, where it lights up things at night. To the "T"'s bottom outlets at the tank head I can mount the Weber plus a Coleman propane campstove, and greatly assist the buscuit burner when cooking for a crowd. I recall buying the basic multi-outlet "T" with long extension at a sporting goods store, along with the extra hoses for multiple devices, but nowdays Camping World advertises a similar device called a compact distribution tree, #30335.
Though I've also considered tieing into our coach's system, given the effort involved it never seemed as good a way to go overall as my old tried-and-true, easy to store (and forget) little system that takes up less room than the old original Weber portable BBQ itself.
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Joel