How old are your kids? If they're under 10 the 7 seater is a viable option, but if they're much bigger than that, the 2 seats in the cargo area will not be fun to sit in for extended trips.
You will definitely need a roof rack of some sort.
If you go for a D2, find one with service records, lots of them. You'll know what's been done plus there's a better chance the owner took care of it. Or look for a deal. Sometimes people want to sell the truck when it needs head gaskets and that can really drop the price. Other repairs to expect for a D2 are as follows:
Head gaskets- Know the signs of them going out and look for them during your inspection.
Front drive shaft- Just buy one from Tom Wood's. Everything is serviceable (u-joints and centerball) and you'll have a stronger unit. A high mileage stock unit is a ticking time bomb that take out your tranny. Sell the stock one or keep it as a spare.
The 3 amigos- Look it up, there's even a shirt for them. ABS, TC, and HDC lights all on. Might need an ABS modulator, the re-build kit, or ABS sensor.