When i made the opening above the water tank at the bed end i cut the maximum size possible between the existing frame supports. Allowing for the following. This was 3 seperate openings + one on the drivers side.
On top of the water tank i glued down pieces of foam packing from a parcel and laid a thin ply sheet over it. Then i made sure the front height of the panel was about 2 inches above this to stop the shoes coming out. This then gave me a great shoe storage area and access to the winerising connection for the antifreeze connection.
look at https://cencerrita.com/winterise.htm for photos before the shoe storage was complete but it shows the tank access made. . email me if you want a phoot of the finish
footlooserv@cencerrita.com
