I'm not sure having more than 3 people on a bench seat is legal...that's why only 3 belts. It'd be a squeeze, anyway.
You might consider a 67-72 Blazer or 'Burban...?
I've seen old "extended cab" trucks, too. Maybe somebody welded a couple cabs together and shortened the box, etc. Maybe factory?
I've always been partial to wagons, myself...Nomads, sedan deliveries, panel trucks...
Just some more to think about!;)
Best luck,
cm
