Ambitious project!
"Host vehicle" works.
A 60 km range is going to be another challenge - unless of course you have a source for "cheap" lithium! The ForkenSwift gets 20-30 km on ~520 lbs of used golf cart batteries (~10kWh worth). Might get 50-60 on brand new ones. And that exceeds our far more modest design target of 12 km minimum (distance from my buddy's place to his work). No girlfriends in the next town!
