There are ski and snowboard racks that can be used without crossbars. Typically these types of racks come with brackets that can be attached near the door crevice or strong suction cups. Some popular models include the SportRack Complete Roof Rack System or the SeaSucker Monkey Bar Roof Rack System. If you don’t intend to use your ski/snowboard rack very often or don’t want to permanently attach any crossbars, these are some alternative options.