I've added propane to two boats now and will soon do my third. I built the tank lockers to hold standard patio grill tanks to avoid problems getting them filled, and the high cost of "Marine' tanks. The patio tanks are steel and will rust, but if you do the tank exchange thing (at nearly any gas station in the country) they won't be on the boat long enough to be a problem. You get a new(er) tank every time. If you have your tanks refilled, eventually they'll expire and need recertification. Just take them to the corner gas station and swap for a new one. Same cost as a non expired one. They don't even look at the date.
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