Abstract: An improved trailer convertible to one position for hauling floor supported cargo and to one other position for hauling granular material. The trailer has a floor assembly including; a pair of center floor panels which are supported on the trailer frame and form a portion of the floor supporting structure in one position and which are removable and positionable for cooperating to retain granular material in one other position; and a pair of end slope members which are removably connectable to the trailer for cooperating with the center floor panels and portions of the trailer sides to retain granular material. The trailer is adapted such that pre-constructed sections of the trailer can be shipped and assembled at a remote location.

Abstract: An improved material transfer mechanism comprising a selectively variable speed hydraulic power assembly having an output connected to and powering a material conveyor. A double acting hydraulic ram positions a swash plate control lever that determines the rotational speed of the output shaft, and a hydraulic porting valve assembly is disposed to actuate the hydraulic ram, the hydraulic porting valve assembly comprising a pivotally supported valve body having an internally disposed fluid control means, the fluid control means being variably displaced in the valve body by the actuation of a pressure controlling mechanism for the purpose of selectively determining and establishing fluid communication of a source of hydraulic pressure fluid to alternate ends of the hydraulic ram with the hydraulic porting valve assembly to selectively control the hydraulic ram.