I need about 2" more height above the current hitch ball height on my Freewheeler hitch. Etrailer.com has a ball with a 2" rise, but the shank is too big. The shank hole diameter on my receiver is 1/2". Does anyone know of a ball that has a 2" rise with a 1/2" shank diameter, or possibly another solution. My hitch is a Hitch Doc. Thanks for any input.