I have 3 drains on my Class A... (no reason to think your's is different though).
On both sides of the water pump there is a Tee in the line. One leg on each tee goes down thru the bottom of the compartment to drain outside. Each of these lines has a small, plastic, circular ball valve.
Also, in my water & waste-dump compartment is a small plastic blade-type valve (in corner near the water inlet) that also goes thru the compartment floor to drain.
You can drain your water tank (to the ground outside) in short order by opening that downstream drain & turning the pump on (all faucets off so not to fill your waste tanks).
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