It looks like a PO has customized that back hatch. The hinge is suppose to have a piece of metal that extends under the plywood floor. Probably the reason it has been altered is because it is an inherent design flaw with all airstreams this vintage. Water traps under the back, so somebody tried to separate the pieces to allow water to drain back there. Not such a bad idea, but the wood should not be exposed. This does not look to be well done. Several things here... I would paint or epoxy at least the edges of the plywood to keep the water from wicking into the wood. Next, I would fabricate a sort of flashing with aluminum that will keep water from entering that area. It could be wrapped around the end of the wood before it is shoved under the U cannel. Your photos show the banana wraps still attached. These will have to come off to access the bolts at the U Channel for replacement. That means the molding has to come off too. Once all this is removed, you can access the area better in that area. It will be best to replace the banana wrap with new aluminum, making patterns from the old banana wrap. Use plenty of Trempro in the area back there when all is put back together. One thing to note is that the gap back there will lessen when the floor is bolted down. However I would not start that process until some of the other issues are addressed.
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1965 Airstream Caravel, 2003 Ford F150 SuperCrew, 2003 Miata Special Edition, 1993 Miata Black & Tan
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