I always hated vans, the 67 and earlier ones that were all six cylinders weren't too bad to work on except that the long column shift linkage was a constant problem and the engine had to be pulled out the passenger door using our wrecker as a motor crane. The later ones with V8's had less engine access and still the column shift linkage problems. I did a valve job on a 65 Econoline with a 289 transplanted in it- the alternator live in a box bolted to the side of the doghouse- with white fir all over the interior. I had every fender blanket in the shop tied up trying to keep it clean. We took a fleet customer away from our flat rate neighbor and found a bunch of 460 E350's with 5 new spark plugs and 3 old plugs in cylinders 1,2,and 3 because they were tough to get at.
Conversion vans sucked worse, they'd have a bunch of aftermarket trinkets added on, quite often in a way that required demolition to get at the Ford stuff. The added weight would require extra load tires, when people would buy replacement tires they'd get what the vehicle specs called for and the vans would wander all over the road. The problem couldn't possibly be with the tires, it had to be the alignment we did.
Vans are good if you're a plumber or an electrician, or if you need a chicken coop and don't have building skills.