Looking for my fresh water drain I stumbled on some hidden storage. Behind the passenger rear wheel is a small rectangular hatch in there is a black panel with two access ports behind those is the fresh water pump. I started to remove the black panel by taking mounting screws loose on the bottom and left side of panel. In trying to remove the panel I noticed instead of taking it out the left side can be bent back revealing a 12"x12"x 9' area. I bent the panel back until it touched the water tank mount put a screw thru the panel into wood mount. Then went to lowes bought a 1'x12' low pile indoor outdoor carpet to put in the compartment to cover insulating/soundproof material and walla! pics below.