Abstract: A load supporting assembly for a trailer includes an elongated frame, a platform subassembly having a middle fixed platform section, a pair of front and rear pivotal platform sections being pivotally mounted to the middle fixed platform section and a pair of linkages movably interconnecting the front and rear pivotal platform sections such that the front and rear pivotal platform sections can pivot independently of and automatically relative to one another and to the middle fixed platform section and the frame without the need for any substantial operator intervention and in response to an operator driving a vehicle onto or from the platform assembly. The vehicle in being loaded onto the platform subassembly can push the front pivotal platform section down from the respective raised to lower position thereof without any corresponding movement of the rear pivotal platform section.