Tiger,
We have 3 types of vehicles. GMC vans, a GMC with a Supreme Spartain box (like Active's second link), and a Dodge Sprinter.

We liked the box truck at first, but now we wouldn't but it again. THe bins leak when it rains, it is hard to get in many customers driveways, and it gets 8 MPG. For service trucks, we will buy the Sprinter from now on. The only draw back is it's hard to get ladders on and off.