If you always have the trailer there while fitting/removing the rotors, a simple rope/pulley system off the top of the trailer door would do the trick? It also looks like you are using split pins on the rotor nuts. Would safety pins be simpler/reusable alternatives?

Hi Jeffrey- How is your flying going? I have been hanging out waiting for your next youtube video to satisfy my aviationitis till my machine arrives (on ship now, expected late June). Replacement bolts already? Or are these hot spares for further down the track? Stuart.