Black Water Tank Conundrum

[mel1501]

I have a 1973 Ambassador 29', my question is about the holding tank under the toilet (it's a back bath), the tank is not leaking but it looks enclosed in sheet metal. The sheet metal is rusting away, the holding tank seems fine, no leaks. Should I get rid of the sheet metal enclosure? How do I fix this? Is there a purpose for the sheet metal? Can I take it out or patch it? The big problem is, since it's rusting out/away, it's putting pressure on the aluminum underbelly making it sag. Advice please!!! I have a sinking feeling this is going to turn into a nightmare!!!

Thank you!!

[Aerowood]

You are most likely going to find a real mess. The tank enclosure is what Holds the tank to the frame. The 70's trailers have a problem of water gaining entrance to the rear trunk area / rear floor area. You will most likely find rotted plywood sub-floor, rusted out rear frame components, and corroded aluminum skin. Do a search for rear frame separation and you will find links to a vast quantity of information for this area. Several people have dealt with this area and it generally leads to gutting of the rear lower section of the trailer.

Sorry for the bad news