While on a dirt backroad in South Dakota's Black Hills I came upon a fantastic old farmhouse with these parked in the back 40. I talked to the owners (who have a shiny, newer fifth wheel on the dirt by the house) and asked if they'd be interested in selling. They would be THRILLED to sell these. I took down their info, e-mailed them when I got home but haven't heard back (and have misplaced their e-mail...still diding through vacation paperwork).
ANYhooo...here's what they have hidden on their farm - one used as a storage shed, so it must be watertight, right?