So all I have to say is thanks to a good neighbor at the campground and thankfully I had just emptied the grey and black tank, and that the Ollie is as waterproof inside as it is outside. I had hooked up the black tank clean out turned it on and got distracted with kids, dog, etc. we were getting ready to leave to check out the rest of the campground for the afternoon. We went back to our campsite after an urgent phone from the camp office to check on our camper. Like I said earlier, thanks to a fellow camper they had shut off the water coming from the spigot and helped a bad situation from getting worse. When we walked up there was water running out the front door and about 2-3 in had settled to the rear interior hallway and made its way all the way back up to the front door. After about an hour of bailing, cleaning and disinfecting I have to say it could have been worse. Not a drop in the basement. The shower drain valve was open and from what I saw when I came in, the sequence of water over-flow was not from up through the toilet but rather up through the shower drain, over the shower stall wall and into the hallway. SO hopefully that was our big one for this trip. Always an adventure. Sharing this to help others avoid the same mistake. On to the great state of MI to see my Dad.