what holds black water tank in place

[tw64]

I purchased a 1964 Tradewind recently and of course it needs a little TLC. The black water tank had dropped almost 4", and so did the toilet. I removed the toilet and the underbelly at the rear bumper and then found an access panel at the bottom of the gate valve. It looks like the tank was built in a tin box, suspened some how between the frame. The "tin" seems to have rotted away leaving the tank in a dropped position. Also the aluminum cross brace( you see it when the bumper cover is raised) has dropped down with it. From what has been posted before this tank dosen't protrued above the floor. Any suggestions........

[Pahaska]

A good sheet metal shop should be able to make you a replacement box of galvanized steel if there is enough left to measure.

The tank in my A/S is surrounded bottom and sides by 1" of styrofoam insulation. Probably a good thing to distribute the load and prevent wear spots between tank and metal.

[tw64]

John I want to thank you for the suggestion of taking it to a sheet metal shop. About 2/3 of the original metal has gone. The tank seems to be in good shape though. I like how you tank is suspened, may have to modify and upgrade this idea. I also believe this whole problem started when the vent caps ,on the roof, were never replaced. The tank valve won't stop grey water or rain water for that matter. Hence, leak into the bumper area and then the galvanized steel. At least this isn't the worst case I've seen. Thank you again for the information

[64tradewind]

How did you make out with your tank problem. I have a 64 Tradewind I just brought down from NY to Pinehurst,NC. I had the box for the tank made two years ago at a sheet metal shop for $60.00. Now I have to tackle the floor repair above the tank. Does yours have a compartment lid over the rear bumper. I would be interested to see some photos or dimensions of that. Any good RV supply places around these parts.
Cheers,
John