i have 4 kids, we do alot of long distance travelling and along with that, we hit some trails along the way. i had a ford excursion, up until i lost my job and had to sell it, but it had the 6.0 diesel, it was reliable, had plenty of room, and it got 21 mpg on the highway. yeah it was big, sucked in the mud because the darn thing weighed 8100# with a full tank of fuel, but this past summer we ended up doing the alpine loop in colorado, then we made our way into moab utah, and did a few trails there...they can do trails ok, just have to pick your routes carefully...but for comfort, you can't beat it. i just bought a 2004 suburban, while it is comfortable, i miss the power and fuel mileage of the diesel, but i don't miss the maintenance costs of it either...plus i was told by a real good friend of mine who is a ford diesel mechanic that did my work for me, that if i end up having any issues with the diesel, and have to take it to a shop for work to be done on it, that i should expect at least a $1000 bill when it was done...just because of the amount of computer controlled stuff on it. good luck on your hunt for a new vehicle.