I am a car hauler & I think this is the real deal. It gets no closer to the real thing. I too believe it should be modeled & soled; but if it never makes it to the retail store, I think you should create & sell to the public & I shall be the first on your list!
I like, I like. On the top, the cars look like they could easily fall, so something like a pull out ramp could be in order? Like with a holder protecting it from falling out (which would probably secure the cars at the top as well) or something and you put down the holder so the ramp goes out?
You should take some more pictures of this particular MOC from different angles. Out of what I saw from your creations, this one would be a surefire winner. You should sell this as an actual LEGO set. I think that the cost of it would be somewhere around $50-$60 or so, though.