On my 2008 I can see where the factory cut/hacksawed the lip out of the bottom of the propane hatch. I assume for fear of propane settling low in the compartment in case of a leak. It always held water. I bought some 3/4" X 3/4" aluminum angle and glued that in. No more water and I'll take my chances with a propane leak.
Another issue I have never understood is the plastic tray the batteries sit in. All four of the bottom corners had a 1/4" hole drilled in them. Any battery acid that puked out ended up draining out of the compartment and down the side of my truck. Duct tape and silicone plugged the holes.
I love it but don't use it much and am considering selling it.