Gravity Conveyors, Ball Transfer Tables. Rail, Skatewheel Conveyors, Roller Feed, Heavy-Duty, Medium-Duty, Light-Duty. A gravity roller or rail/skatewheel conveyor will convey light, medium, and heavy loads such as cartons, totes, cases, skids, and drums with maximum efficiency. We are authorized Roach conveyor and Omni Metalcraft distributors with a wide range of custom gravity conveyor