It looks like a homecrafted wooden slat tank tracks on a double rear axle, but it's such low resolution I can't tell for sure. Via: http://www.owensvalleyhistory.com/el_camino_sierra/page76a.html

Thanks Mike!

Built so it could still move under it's own power when it was 1/2 it's orginal width. I wish this had shown up when I searched the web, but nothing out there about it. Wouldn't it be the coolest to look over and see how they built it?!

Watch this video (make up your own audio!) and you'll see about a dozen movie gag cars, they fall apart, lose their doors, and then there's the breakaway special at minute 7:07! The movie was titled "Highway Havoc"



Thanks to Peter in the Czech republic for finding it and sharing it!



The bottom two photos are of the diorama at the Petersen Museum in Los Angeles on Wilshire
For more about the Model T and the duo: http://www.stanlaurelandoliverhardy.com/ford.htm