I've seen some very small military conex boxes before, some of the sides are smooth, some are corrugated...

I don't want a 20ft trailer...

I'd like a 12ftx8ft box... just big enough to hopefully trailer in and onto our new rural property (maybe even have it dropped in by helicopter?)...

But these type boxes tend to be relatively water and air tight... I want something that I can leave camping equipment in without worrying about rats getting into it, and its also just large enough for a couple people to sleep in during the winter.

Ideas?