Best Conveyors Best/Flex 300 Heavy-Duty Expandable Gravity Skatewheel Conveyor is designed for heavy-duty applications, and is ideal for loading and unloading trucks and trailers. Cartons easily follow the twist and turns of the conveyor path without any pre-engineered consideration. Conveyor is designed to handle loads weighing up to 300 lbs. per foot comfortably. The Best/Flex 300 easily expands and compacts with little effort. Individual conveyors may be connected together to create extra long conveyors by adding optional connecting brackets.