I've had two van campers on the Dodge chassis, a 76 and an 89. I had factory repair manuals for both and they both were very good. My experience has been the Chilton are far too general to be useful. You might check eBay as these old manuals come up for sale from time to time. I wouldn't mess around with those generic manuals.
The Xplorer manual may be a problem as at this point, they are few and far between The manual that came with my 89 Xplorer (now sold) was one of the best I've seen, with very good wiring and plumbing diagrams. I would try to come up with one of those if possible. You might periodically run a post on this forum every month or so and see if anyone with a manual surfaces.
Good luck
karl