
What Is The Typical RV Holding Tank Size? - RVing Know How
9/5/2021· Average Size of Fresh Water RV Tanks. Depending on the size or class of your RV, your fresh water holding tank may hold between 20 and 100 gallons. The size of fresh water tanks in Class A RVs is the largest, at between 72 and 100 gallons. In the next size down, fifth wheel travel trailers usually have fresh water tanks that hold 50 to 92 gallons of fresh water. …