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
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