I have an 85 4Runner, and would recommend it without hesitation. Sort-of hard to find these days, but they're out there. If your not in a hurry, just keep an eye out, and eventually one will show up. A IFS would probably work well for you also, since your not planning any "extreme" stuff, and can be built fairly well.

You could also consider a FJ60/70/80 Landcruiser. Most have a solid axle and they are very stout. Problem is parts tend to be a bit more $$.

Having kids myself, I would be hesitant to recommend a pick-up, just because of the seating issue. 4Runners are great because you can fit the family and all the *stuff* that goes with. I wouldn't want my kids bouncing around in the back of a truck (even if there were seats...)

Just my  Hope it helps.

Erik