The local dealer asks $1500 for the tow package, which includes the receiver, wire harness, and (here is where the cost comes in) a transmission cooling coil. If you're going to be towing 5,000 lbs up big hills, you may want to consider that. But probably the "couple hundred dollar" option will suit your needs just fine.
Big cargo vans are heavy vehicles with terrible fuel economy and are expensive to repair. If you don't drive much and can do your own maintenance, you can do okay. If not, based on my own experience, they can be a serious money suck.