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Originally Posted by Darol Ingalls I've never been able to figure out what that box is for. I had a new one made for one trailer, but on my '68 I used a piece of 1/2" plywood supported by the frame extentions and a new sheet of aluminum for the underbelly. Holds the foam block and tank just fine and allows some air circulation around the tank to keep things dry. Seems like the metal box just collects water from the road. It may not be the best for below-freezing temps, but should be OK for spring/summer/fall trailers. Darol |
The metal holding tank "box" is a container.
When properly installed, heat from the furnace is circuated around the tank, to keep it from freezing.
Keeping the tank dry is almost secondary to keep it from freezing.
An open holding tank pan will allow dust and dirt as well as water from the road, when towing in a rain, to enter. That same water will certainly attack any wooden exterior parts.
Not a good idea, as the pan will surely rust away quicker if you use galvanized metal.
A wooden holding tank pan, is sort of doomed before it starts.
Holding tank pans can easily be made by any good local sheet metal shop.
Andy