It is a very tight fit. It is probably the biggest drawback of this floor plan. I know that the black and grey tanks in older models were not mounted very well as I have seen it and repaired mine with a better support system in a 2006. The water tank is in the front of the unit and is accessible from inside at the first step up to the cab over and is mounted better. Not sure what is any different in newer ones. I camped in mine off the truck many times but if you do, my suggestion would be to keep your fluids to a minimum and keep the jacks at their lowest. If you can support it from below I would.