We have a 22 gallon "blue boy" and have used it extensively. We fill it as needed, leave the little cap off as a vent (velcroed to the tank) while filling, use a piece of short hose and watch it closely to avoid overfilling. We have used it for both black and grey water. We carry ours in the back of the truck. Ours has a metal handle that fits over a ball type trailer hitch on truck for transport (walking speed) to dump station. We wouldn't be without it.
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