how many gallons of water does a black water tank hold
The black water tank holds the waste from the toilet. The size of these tanks varies with the size of trailer. As an example, a 24-foot-long trailer may have a fresh water tank that holds 48 gallons, and gray and black water tanks that each holds 32 gallons. A 35-foot-long travel trailer can carry more weight, so it may have a fresh water tank that holds 90 gallons.