I'm looking for a propane tank that will fit inside a 10lb CO2 tank holder. Will be attached to my little overlanding trailer. Would like the tank about 7" diameter, and about 18" tall max (so we're talking tall and skinny, not short and fat). I've seen the old school skinny aluminum 6lb tanks, but they're too tall (about 22" tall) and way too expensive. Any suggestions? Would probably be about a 5lb size. Thanks.