QuietKat 1UP Add-On Tray - Hit the trail with friends and family easier when you add an additional 1UP eBike carrying rack to your standard single or double Super-Duty Rack. Built and manufactured in the USA. Features: The easy-to-install add-on trays allow you to carry additional electric bikes using your QK bike rack by 1Up. Add up to an additional two add-on racks to your QK 1UP Rack to carry up to three 75lb electric bikes at once. More than 2 Add-On racks will increase the weight capacity beyond the 225lb rating of the hitch system.