There's a place called tri state rotational in Ashley/Hudson Indiana where i bought mine for my skoolie and i just bought three 95 gallon black/grey holding tanks, and three 97 gallon freshwater tanks. The fresh water tanks are 17" wide x 22" high x 60" long and the holding tanks are called coffins and they are basically 20" wide x 14" tall by 80" long, they all just barely fit in my rear cargo bay.