Thanks, I like the "Macgyver" style of your fix! I have the rear 2 feet of my bathroom floor removed, due to rot around the edges, and can see that the frame and angle iron box the black water tank sits in are in very good shape. I will drop the belly skin and make a fix similar to yours. Thanks for the additional insight to your project, it helps.
I dropped the bottom pan off of my 1968 Airstream. I found the steel angle iron holding up the black water tank was rusted and replaced it with a piece of bed frame. I had rotten flooring at the back probably from a frozen battery. I cut pieces of 3/4 inch plywood to fit in the cabinet and around the back of the stool. I then cut a piece of 3/4 inch plywood to fit under the floor and screwed it with wood screws. (Long drywall screws that went into the wood above. At the outter edge of the wood, the trailer shell has an aluminum frame that is screwed to the members going up and over the trailer. I drilled holes up through the wood to the metal that would allow a long sheet metal screw to pass and used a smaller drill to drill a pilot hole from the screw. I used stainless steel metal screws and put them about an inch and a half apart around the bottom of the trailer. Lyall
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