I got a compartment key online, I think etrailer. I had heard they were all the same too, but since I couldn't get one made locally I googled the brand and numbers on they key and came up with that.
We got the door (regular and deadbolt) made at a ACE hardware, first one didnt have the blanks but the second one I went to did.
If we have plans that seem like there is a higher chance than normal of losing our keys I hide my door key in a compartment, and use a hide away to hide my compartment key. I have heard some people get a combination lock box and mount it to the frame somewhere to keep spares in.
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