OK, another opinion:
Assume you have not started the coach.
Use your jacks to lean the coach front/back AND side/side so that the fuel fill is the "low point".
Buy as many feet of clear vinyl hose as it takes to go down the filler neck to the bottom of the tank AND to the ground. Secure a weight to one end of the hose (like a fishing weight that you attach with wire through one/two holes very close to the end of the hose.
Let the coach sit for at least 2 hours so that the water/Clorox migrates to the low point. Feed the hose into the bottom of the tank. Start a siphon and capture all of it in a clear glass container. If you can remove all of it, you are good to go.
If not, look up "Fuel Polisher". They clean contaminated fuel for a living.