Yup, balance would be paramount. I was thinking in between the wheels so you are not having to carry it too. The new lion packs for bikes are getting really small as ar the motor drives. Obviously depending on many factors you'd need several packs and chargers. I wished badly for something like that when I broke up and hauled off a cement walk way. Jack hammering out a ton (literally, they weighed it at the dump)of rubble and wheeling out of the yard then up a ramp into my trailer was way too much like work.