If you keep looking, you should find some pics with the vans on hoists.
Seems that the rear is removing all but the main leaf, with coil-overs installed and anti-roll bar.
Front was cutting coils and stiffer shock, with much bigger anti roll bar. not much before they bottom out!
Pics here
http://grassrootsmotorsports.com/forum/off-topic-discussion/lowering-a-dodge-van/19431/page1/There are videos too.
Here's one
https://www.youtube.com/watch?v=zU0RAj-1gxQI got a 2500 and cut a coil off the front to get it down. Since I don't want to spend a grand on the rear (and mess with load capacity) , I'll probably use a drop rear spring shackle (longer, raises the rear of the spring, lowering the ride height), but that requires cutting a hole in the floor.
I also didn't have the bread to throw on a high-dollar set of the correct wheels, so I used later model Dodge truck 5 spoke 17" wheels and low profile tires.
The wheels I used had more offset and required spacers, grinding and new lugs on the front, and deep spacers on the rear (narrower track on the rear stock).
