Friend of mine has made one for his EC 120 (his engineer father in law designed and built it). It goes into the wheel brackets and uses a haudraulic car jack as the lift bit. Then has a ?winch motor with a remote control box on a wire. Press button and it drives the 120 around anywhere you want to go. But don't know how it would go with the pop-outs.
Works well with one person.
If you want some pics let me know and I'll get some for you.
RR