For over a year, we have been testing an electric passenger vehicle and the ability of it's charging to be done from the capacity of our solar array. The goal is to consider the possibility of electric trucks for delivering our product, which is typically a 120-150 mile round trip in an urban setting.
There are some thought that battery capacity needs to improve so that a vehicle with a load can make the round trip back to home-base.
Federal Express can test components of such a fleet vehicle with perhaps more credibility than our small operation. Read just such a story here:
http://blog.cleantechies.com/2012/02/08/the-future-of-trucking-is-electric/
Photo from Flickr by user LA Wad.