I counted six in back. The second row outboard seats are pleasing to the back and leg and hip room are good. Head room is outstanding. The third row seat is definitely wide enough to hold two adults but the low seating position makes it more appropriate for a couple of pre-teens. Storage with the third seat in position is adequate enough for a few sacks of groceries or a suitcase.
Storage increases dramatically with the third seat folded up and out of the way.
Fold down the second seat, and a vista of 88 cubic feet of cargo space opens before your eyes. The Durango for 1998 comes only in four-wheel drive. With the exception of low, everything is shift on the fly. Eventually there will be three engine configurations. It's the engine I had in my test vehicle and its a bruit.