George, there's nothing wrong with HuffER -> ERector - it's not an error. It doesn't have to be just the single last letter repeated (which gets boring real fast), as long as the new word somehow fits on the end of the previous word. Like my next move:
Road Ranger -> Razorbeast -> Steamhammer -> Rodimus Prime -> Emirate Xaaron -> Night Scream -> Magnaboss -> Scythe -> Energon Hot Shot -> Hot Zone -> Nebulon -> Longtooth -> Huffer -> Railspike -> Erector -> Roadbuster -> Rewind -> Windmill