One may not expound upon the sexual rules (Lev 18, 20) in front of three [students], about creation (Gen 1) in front of two, or the chariot (Ezek 1) in front of (even) one, unless he is wise and already understands it on his own.Erich von Däniken interprets the living creatures as machinery, and the Glory of the Lord as an alien visitation in a spaceship. NASA scientist Josef Blumrich was so convinced, that he created several working designs from von Däniken's ideas. McGee says emphatically that this is NOT a "prophecy of the present mechanical age ... If that is what you want to see in this vision, ... that is silly and senile!" There are clues later in Ezekiel, and in other parts of Scripture.
I see the wheels as projections from higher dimensions or another world. The connection between the creatures and the wheels is not part of our universe - as when the 3D man visits Flatland in the novel by Edwin A. Abbott, or when the Oyarsa visit Venus in Perelandra by C.S. Lewis.