A couple of hub motors, a repurposed pack from a smaller EV, a controller and charger, and Voila! Self-propelled trailer.
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.