My first impression is that the ultimate vehicle is shoe leather or a bicycle.

The original Willis Jeep - small, light and all of 36 HP or so, and geared low, giving you a maximum speed of about 50mph wide open - might be the icon to shoot for. Simple, durable, repairable, all-terrain, and efficient.

The Zap Xebra might be a good over road vehicle. All-electric two-seat car:
http://www.zapworld.com/electric-vehicles/electric-cars/xebra-sedan

Or perhaps as a cargo van:
http://www.zapworld.com/fleet