Looking at the pictures I can tell you that the front drive
train is out of a Ford pickup that uses the coil spring setup.
I think Ford started the coil spring front end in 2005? As
far as I know there are 2 shops that do this type of conversion.
Quad van, and Whitefeather. Whitefeather seems to do more
Sprinters these days and they were started by Craig Jackson
who used to work for Salem Kroger. Salem Kroger was using
the coil spring setup before they closed shop. I know there
are some members here that have vans converted there.
My bet would be that this van was done by this guy in California
named Javier. I see his stuff on Ebay now and then and he even
has some You tube videos of his vans. Not sure about the quality
of his work. I also believe Colorado camper van is doing a conversion
with coil springs.