EB Exterior Hatch Latch/Lock
If you ever need it, I've determined where to source a replacement exterior hatch latch/lock. The company that manufactures them is Eberhard Manufacturing, p/n 16900-03 <http://www.eberhard.com/node/21610> -- they are only $15!!
Airstream modifies this latch slightly by cutting down the square shaft that faces inward. This would be obvious when you compare the old and new side by side.
There are also more specs here:
Background on what let me to find the latch:
A few months ago, the spare keys to our EB were stolen when someone broke into our TV. Despite not regularly parking our trailer at home, I wanted to change all of the keys for piece of mind. For convenience, instead of engaging a locksmith, I chose to replace the locks with new from Airstream Supply (relying on odds of getting differently keyed locks when I ordered). Debatable whether this was the cheapest approach -- probably not.
I replaced the entire deadbolt assembly, then for the main door latch I ordered the entire latch, but simply replaced the lock cylinder. On the plus side, I now have a spare latch if I ever need one. For the hatch latch though, Airstream Supply didn't carry this part, so I did a bit of research to find the right part number directly from Eberhard. Similar to the main door latch, I ultimately just replaced the lock cylinder.