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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
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