One wheel trailer... the "Trailcar" by Allstate (division of Sears)

The above photo is thanks to Nik (who finds cool photos all the time) check out his blog at http://carrosantigos.wordpress.com/

I never know where or when I will find something unusual or interesting, something I've never seen before... like a one wheel trailer. They are in demand by VW people I was told by this new owner, he'd just got if off ebay

That the wood and plate are in such amazing great original condition is astonishing, the major frame piece has been repainted, but the wood wasn't touched

The reason this doesn't fall over (like a person on a unicycle) is the from cross member that is bracing the side to side load ( it's the black part at the bottom of the photo below

The advert is from a JC Whitney like catalog that Randy let me scan, Warshawsky's http://justacarguy.blogspot.com/search/label/Warshawsky

For a couple galleries about trailers just like this: http://singlewheel.com/Auto/AllstateWood2.htm