Help finding potable water drain plug

DO not have that model (or make) but places I've found them and description

Directly UNDER the tank. small pipe extending through floor. Pipe cap on it (Remove pipe cap you get wet) Same with not only pipe cap but valve (Remove cap, open valve, get wet)

This on several trailers.. Not all mine.

ONE possible variation of this is a "Remote" operated valve (there is somethign INSIDE the RV you operate the valve with) but you will still see the pipe extending through the floor and under floor.

ON My Current class A there are two options

The water "outlet" to the pump is on the side of the tank (if I open the access door) and it goes to a quarter turn valve. then a "T" (the T runs off to the pump) Then a 2nd Quarter turn valve (The drain) and out through the bottom to drip on ground

There is also a 2nd outlet. I removed the plug and installed a petcock type valve.

it'll be somewhere near your fresh water tank, maybe a valve rather than a plug.

Obvious question, have you looked underneath? Can you see your tank?

You have examined the underside of your C closely? Won’t be too far from the fresh water tank.