You're build is very similar to mine. When I originally submitted my order to my dealer way back in July I had the premium capability package as a must but after reading about issues related cold weather I decided that the benefits of the air ride isn't worth the potential hassles. Being in a location in Canada that also gets -30 to -40 and having a different sales manager tell me that the systems aren't designed for -40 kind of swayed my decision. I wanted the air ride for the ability to easily lift the vehicle a little bit. Instead I'll get a leveling kit that I've seen others on here used. Can't complain that the leveling kit is $300, compared to the $2000 capability package, aside from the other parts of the package. Last week my dealer finally called and said they might be able to get my Yukon built, but max trailer and advanced tech are on constraint again. I had wanted advanced tech but I bailed on that too. Once again saving money as advanced tech is now a $6k package because of supercruise and rear seat media. It's really annoying how they have all of these packages, but in order to get this package, you also have to get that package. I wish they would stop trying to trick the customer.
Long story short check with your dealer about advanced tech if you're considering it. I'd be interested to see if your dealer says it's on constraint too or if my dealer just doesn't have an allotment for it or something.