I installed the gasket from the inside for access. It has to be removed when we lift the cab for service. No glue since we have to remove it periodically. The flange on the stainless rails is hemmed to provide a snug fit.
It has been on and off a dozen times in the past year without any issues or leaks. The stainless rail serves double duty since it will not react with the aluminum body and provides enough strength to handle the traffic thru the portal.
I left around a 2" space between the rails I fabricated to allow for cab / rv box movement. I only have airbags in the rear, so it does not matter if I am aired up or down as there is enough flex/slack in the gasket to allow for movement.
I did caulk the corners...the alternate is to have someone weld the stainless after it was installed.
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