Looks like I can get one pretty cheap maybe. Minimal rust, ran when parked etc. Looks to be of late 70's vintage. 350 auto.
Some googling suggests they are built roughly on the same platform as the c20/30 pickups.
Looks like it would make a very cool motovan.
Aerodynamics of a brick, and they rattle from every single panel. Mostly just a GM truck with an aluminum box stapled to it.
Don't crash into anything, for chrissakes.
Also- some of the older ones had dually rear ends that were narrow enough they almost fit under a straight sided pickup truck.
Learned how to drive 3 on the tree on them from one parking lot to another...
Worked nights & weekends at a service station next door to a Krispy Kreme donut factory in HS. Did 10-15 oil changes per week on P vans. Don't know jack other than that...
Don't expect any noticeable heat or AC
I don't listen to them because they aren't my real van.
In reply to Knurled:
That was good. 
I know I want one to replace the tents we use for timing and scoring.
Ok, so far all your input is about what I expected. Loud, crude, rattly, and simple. And that one I hotlinked looks awesome...
So with some careful attention to sound and heat insulation, a turbo 4.8, and a couple bench seats I think it would perfect!
It even has lettering from my friends old construction company. Perfect patina!
Lots of room for seating for 5-6 up front, and room in the back for bikes and sleeping.
Part of me thinks the only appropriate drivetrain for one of these is a 292. With a four speed transmission with a shift lever three feet long that angles forward like a Cobra but you still have to kind of reach behind you to shift.
I have had three, one Ford with the 300ci 6 and a Chevy with a 350 and an International with a 345. The Ford carried the racecar in the back with a sleeping platform over the car's nose. The International was a full RV conversion and the Chevy was a plain cube van. All worked well and with a divider heat and ac was not an issue. I have seen some with a small lounge and storage in the rear. Just remember, they are a truck and not high on creature comforts. Still they can be made very livable and work great for your intended use. If the buy in is cheap enough, go for it.
I've had a few of varying sizes. One was 14' SRW and it was basically a 3/4 ton chevy pickup/van with standard GM bits under there. Most will be IFS until you get into the bigger ones.
I had a dually 18' with a 6.2 Diesel. Same basic thing, but based on the GMT HD platform. Still, GM truck/van underbits.
Bulletproof setups. Big, rattly, noisy box set on top of basically a GM truck.
I've owned one and it was as noted above: huge, rattly, slow, poor mpgs, and tons of character. Apparently some of them had a tendency for the rear axle to exit stage left-mine had the scars to prove it and I've noticed them on several others. Check your rear springs carefully 
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