We had a number of these vans when I was a fleet mechanic....maybe not as "well appointed" as yours, but they did posess some of the same traits...
One thing that created unending misery with electrical problems was the bundle of fusable links that pass over the drivers' side inner fender in the engine compartment. That, and Chrysler's game of creating "mystery grounds" all over the vehicle.
Don't rule out a fusable link because battery or charging voltage is correct (or close to it). Many times, I've seen what looks like perfectly normal wiring, only to open the harness and find more corrosion than a shipyard or more fungus growing in there than a commercial mushroom farm.
We had one Dodge Caravan that seemed to be doomed to endless service calls, at all hours of the day & night due to an intermittent no-start condition.
When it got so bad that the dopers downtown wouldn't try to steal it anymore, I decided to take action. (my boss was a "die hard" Dodge fanatic, so junking it was out of the question). Once I cut open the harness, I discovered a mass of open circuits and cross-linked shorts and grounds.
A few hours cutting out the "cancer" and replacing it with plain old automotive wire, the van would start and run instantly for the remaining time before we finally put it up for auction. As far as I know, it's probably still running out there, somewhere.
No good deed goes unpunished.