Sealing Galley Hatch

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I'm kinda lost as to how to best seal the hatch. Does it matter if I place the gasket on the back edge of the trailer, on the galley door itself and/or should I add something else (framing?) inside the back edge?
Also, does anyone know of a source for latched like a hood latch on a large commercial truck hood? Or like the old jeep hood latches? I have seen them made of some kind of h.d. rubber-like material but can't find them now.
Any help appreciated.
[/img]I'm kinda lost as to how to best seal the hatch. Does it matter if I place the gasket on the back edge of the trailer, on the galley door itself and/or should I add something else (framing?) inside the back edge?
Also, does anyone know of a source for latched like a hood latch on a large commercial truck hood? Or like the old jeep hood latches? I have seen them made of some kind of h.d. rubber-like material but can't find them now.
Any help appreciated.