Ford still makes the van chassis they just don't make it with the powerstroke motor anymore.
We have started replacing the old Fords with new Chevy 4500 with the dmax/Allison combo with a EVG box but the word is we aren't getting anymore Chevys because they always break, they ride like hell...the bounce like they have hydraulics, and they're raked so much you can't pop curbs because the front is too low.
The problem is the dampening on the shocks, especially in the front. They've got heavy duty springs on all four corners due to the added weight but apparently either Chevy or EVG forgot about the shock package as well. I can literally make the front end bounce a solid 8-10 inches idling through the garage tapping the brakes rhythmically.
The design of the console between the seats in the front is garbage, the airhorn is tough to reach, the siren box is near perpendicular to the floor which makes it tough to operate, there's no power outlets, the cup holders suck, there's no shelf space on the console like the Fords have, the Master Switch is in a dumb spot and is the wrong color (made the mod power switch red and the master black...so everyone always just kills the mod power rather than actually activating the overhead lights, the stupid toughbook mount doesn't even fit our computers so all it is is a giant hard object with sharp metal corners for us to wack our heads on.
I generally ask if I can take a Ford if I'm assigned a Chevy. My assigned unit is a 2004 E450 with the 6.0 powerstroke and she's my baby.
My personal truck is a ford and she treats me right.