I was flipping through my latest Popular Mechanics and saw what I first thought was a mini. http://http://www.popularmechanics.com/automotive/new_cars/4234572.html?page=2 Looks like a mini but runs on electricity. Appears UPS needs a way of moving things more economically than their oversized vans. Maybe 12" hiway tires will increase in selection also.
I've actually heard of some propane "mini" trucks being used by big factorys, haven't seen myself to verify but I heard gulfstream (the private jet maker)in savannah uses some in there "HUGE" wharehouses, they can't use gasoline for obvious reasons inside