JMI Telescopes makes this large Universal Wheeley Bar to support and more easily transport larger field tripods and telescope rigs without having to disassemble heavy and awkward components. It comes with 5" hard polyurethane locking wheels that allow you to move your rig to your observation point and 5/8" heavy-duty leveling screws to properly level your tripod when you move it from point to point for accurate alignment and proper tracking. This standard wheeley bar is designed to be used on hard flat surfaces such as driveways and concrete pads. It has a maximum payload capacity of 300 pounds, tip receptacles with an inside diameter of 2.25 inches, and is adjustable to fit tripods with a tip-to-tip distance of 49 to 56.5 inches.