Going away because the majority of SUV/CUV fashion statement crowd does NOT tow heavy
Today's station wagon
There is a 1 ton Suburban, but designed for government business and high dollar rollers who can afford to armor plate them...but...that only has a MTWR (Max Tow Weight Rating) of 3,000 lbs
Before SUV's become the highest margin vehicle for the OEMs...Suburbans (the longest running continuous automotive badge) were real TV's for towing heavy
GMT400's and GMT800's were the last of the 3/4 ton. Yes, the next gen after the GMT800 did have a 3/4 ton, but for the sake of looks...marketing told engineering to 'hide' the receiver behind the bumper
So, the receiver is now part of the bumper and with that, has crumple zone duties....which gets stress raiser notches on the connecting bracket between the bumper/receiver to frame rail
The why of the 1,000 lb max tongue weight rating with a WD hitch system
A 3/4 ton GMT400 (7.4L big block) and GMT800 (8.1L big block) Suburban has the same rear axle assembly as the 1 ton dually of that same year, with the leaf spring pack a bit softer sprung during the initial travel. AAM (American Axle Manufacturing) rates those axles 10,000 GAWR and GM puts on the brakes/springs/etc and re-rates them 6,000 lb GAWR
For the OP, an Esclade 'can do it', but if at the limits/ratings, not well during a MR Murphy meeting.
The 6.2L is aluminum and more hot rod (lower duty cycle rating) than towing (higher duty cycle rating)

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