Abstract: A tractor towed stock trailer having a stock carrying platform which may be lowered directly onto the ground for loading and unloading stock and raised to a stock carrying position for transport. A pair of upstanding side plates are pivotally supported at opposite sides of the platform, each having a wheel carried on a lower end thereof, and pivotable as a unit structure about a common transverse axis secured to the side plates adjacent the upper ends thereof. Each side plate is of a triangular shape and, when the platform is in a lowered position therefor, has the apex portion between the upper and lower ends thereof in ground engagement.