I have heard that the M Class have Class 3 hitches and heard that you take the panel out like you are changing a spare tire. After the hitch mount is there, you cannot cover it up. I was wondering if there was an aftermarket system that would allow you to leave the receiever there and cover it up when you don't want to use the hitch by removing the hitch and covering up the receiever. Essentially what I am looking for is a hitch system that can be concealed when not in use. TIA