I have a Georgetown 350 and it came with a special wrench. Mine was located in the bottom of the storage compartment where the 50amp power cable is located - can't recall if I put it there or if that is where it was located when I picked up the RV. Looks like a big "T" socket wrench. Anyway, if you look closely at the lug nut covers, on the hubs, 3 or 4 of them have a little slit/indention in the chrome lugnut cover. These are the lug nut covers that can be unscrewed and the hub will come off. The others are decorative on the hub. Once you get the hub off you will see the real lug nuts. I put valve extenders on mine. Was a pain to do - had a hard time getting them screwed onto the existing the valve stem. My RV is at the shop for some warranty work, else I would take a picture and show you how I did mine. Good luck.