Gravity roller conveyors are recommended for handling packaged commodities with a reasonably smooth, flat or firm bottom surface to contact the rollers. Irregular shaped loads can be conveyed if they are containerized or palletized. Gravity roller conveyors are the basis of most package handling applications due to simplicity, low cost and minimal maintenance. Roller conveyors are available in a wide array of sizes and capacities to suit most applications. SailRail recommends that flowability testing be conducted to ensure customer satisfaction with the performance of the gravity equipment, as repeatability can be an issue. SailRail does not recommend the use of gravity conveyors for automotive style racks and shipping containers. Another standard feature of the Gravity roller conveyor is heavy-duty forklift bumpers to protect against erratic forklift traffic.