WOW! Thanks for all the responses.
Currently I have an 05' Sierra 1500 CCSB, with a camper shell on it. Within the last few years I've been eying up the Yukon XL's. Like many of you, I to have kids. Ages 9, 7, 4, and 1. Another kid is 50/50 right now. Right now my truck suits us just fine. We can go anywhere, and pull anything. I've done a lot to the truck in the years that I've had it, and as it sits now it's everything I've ever wanted in a truck since I was a young kid and saw my first lifted truck.
With eyeing up the Yukon XL lately I've also been thinking about a diesel. Only because I know I will have to tow 6k+ pounds every so often, and we can rent campers and boats from base whenever we want. Also whenever we get reassigned those long cross country trips it would be nice to be sitting in a Denali package ha ha.
In the last week I came across a "DuraKon". The specifics on what I'm talking about is a 06' GMC 2500 Yukon Denali XL. It has the 6.6L Duramax LBZ engine and 6 speed Allison Transmission. It is also 4 wheel drive which I need out here in the NW. It has 106k on the clock, with stock 3/4 suspension. This guy turns these out every once in a while, and he just listed this one.
I've been battling myself every single day since then. I love my truck because I can throw just about anything in there without worry about getting it dirty. The space is enough as well. The short bed on the truck is 5'8" and I want to say through my research that the Yukon XL has a 4'3" "bed"?
I guess I'm looking for help to convince me more that I need a Yukon XL lol!