I am passionate about one day owning a camper van that gets at least 60mpg.  Raser Technologies has a batter power converter... a new moter and battery system that allows you to drive 40 miles on just electricity!  But like most new things you can't buy it yourself and do the conversion... and it's astronomically expensive. You can read more about it here http://www.rasertech.com/  and I posted a blurb about it on my site http://www.convsersion-vans.net  or search it online.

The new downside is now that GMC has sold Hummer to a Chinese Company you once again can't get an American Car that is full electric.