Floors are cold, really cold. So before the last trip I bought some cheap carpet and cut it to fit the kitchen/eating area. Had to lift the fridge a bit to clear it. I spray glued foam floating floor backing to it so it doesn't scratch up the vinyl flooring. That way it can be popped out for summer. I also didn't do any in front of the door, that way wet boots don't just soak it.
Then I added a drain for the hot water heater. It has a valve it uses when it gets close to freezing to release pressure I guess. Good to know..... It dumped a lot of water out onto the floor. (you can see my ghetto vinyl tube in the carpet pic) now its a proper drain, down through the floor.
Drill big old hole.
Make up the fitting and measure the piece of pipe needed. I am using PEX, its awesome.
And wala, water goes out the bottom of the truck!