Update
We finally put some real miles on the AWD GMC and could not be happier with the Van.
.
A trip to northern Maine fall camping gave us a chance to realize how well a Van works compared to the Tent camping we also enjoy. We had 2 long days of driving planned and pulled the Van into camp at 9:15 PM by 9:25PM we were in bed, we woke to rain in the AM and were on the road in 15 min. We did have some apprehension about buying a fullsize Van, but the thought of packing up a tent in the rain and the time saved made it rapidly fade away that early wet morning.
.
The mileage at 70-75 mph is 16.5 mpg dropping to 14.8 mpg in the mountains. (12.8mpg if you use the remote start while in bed to run the rear heater alot....
...) The 5.3 and 3:73 gear did better than I expected in the mountains, it pulls the heavy Van 70mph up most grades at 2100 rpm in OD with the cruise on.
.
.
.
The AWD and BFG A/T's did allow us to go down some big hills to remote river campsites and not slide on the mud and leaves into the trees . The GMC AWD 1500 may be just enough for our back country needs, we will see............