If you want to tow that trailer with a GM SUV then I would look into the Suburban in the 2500 or 3500 (whatever they're labeling it as now) chassis. It was just released this year or maybe next year again since they dropped the 2500 Suburban chassis after 2013.
You can probably option up a Suburban to have nearly all the creature comforts of the Danali.
The heavier duty chassis with 8 lug wheels will also have heavier duty axles, brakes, driveline, frame, etc.
I've heard these are only available now to "fleet purchase" but any creative dealer who wants to make a sale, particularly one who moves a lot of white work vehicles, should be able to get you one.
Or, you could simply buy a 2013 or older 2500 Suburban.
Either way, the 1500 series chassis that you have is not up to the task of supporting the tongue weight of that trailer. Especially when you have your family and gear inside the vehicle.