The guys at work were joking that I should put a reefer unit on the front and start selling steaks door to door or make it an ice cream truck.
I went with a double dead bolt. I will add a latch to the inside and a handle on the outside later when I find something that catches my eye.
I am building this with only the rough master plan in my head, so far I have only sketched out a few things. Half the fun is looking at pics, looking at other rigs, and browsing hardware stores/ supply houses to get ideas for the next phase.
I found this little detent ball at home depot to hold the door closed.
Here is the nice, wide door opening.