Just key in rv portable dump tank or anything thereabouts and any of the online sellers will offer you a number of different brands and capacities ( Amazon, etrailer, even Wal Mart). I do fine with a 25 gal.as long as I don't let the gray water tank max out before dumping, but I'm not a boondocker. Just remember those things get heavy, ( a full 25 gal. weighs over 150lbs). Some have front as well as rear wheels and pull like a wagon. You may however consider a larger capacity for dry camping. One of the boondockers on here can probably give better advice on capacity.
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