LP tanks are often measured in gallons, although LP is sold in pound units. A 40 pound tank holds about 9.5 gallons of LP.
Unless you have a LP generator, I'd think that the LP tank is adequate for quite a bit of hot water and cooking, with a few nights of furnace heat thrown in. If you want to stretch the interval between refills, you could use full hook up campgrounds and use electric heat and the microwave. Also, you could add the proper plumbing to add a portable tank to the on board tank if needed, but I'd be hesitant to extend time between fill ups for the hazards of a portable LP tank.
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Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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