What I have read you can pull the Elio on all three wheels, as I plan to pull one behind an RV.
we travel 6 - 7 months a year in our 5er and my bet is when you roll into a CG with an Elio in tow, you will have folks all over it .... it will be interesting to see how they are able to mount the tow bar .... at the Elio's weight, no brake control should be needed
Jim