This old wagon appears to be sinking into the earth as a shadow of the wagon is used to be. I'm wondering if it's a form of buckboard? "A buckboard is a four-wheeled wagon of simple construction meant to be drawn by a horse or other large animal. The "buckboard" is the front-most board on the wagon that could act as both a footrest for the driver and protection for the driver from the horse's rear hooves in case of a "buck". The buckboard is steered by its front wheels, which are connected to each other by a single axle. The front and rear axle are connected by a platform of boards to which the front axle is connected on a pivoting joint. A buckboard wagon often carries a seat for a driver. The main platform between axles is not suspended by springs like a carriage." Wikipedia
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