Abstract: A system for preparing earthen beds for installation of pipe thereon comprises a trench support frame, disposable at least partially within an earthen trench in which pipe is to be installed. A grading assembly is coupled to and movable within the trench support frame. A bedding material supply system is integrated with the trench support frame, the bedding material supply system being configured to provide bedding material to be graded by the grading assembly to prepare a floor of the earthen trench for installation of the pipe within the trench.