2021 Yukon, 6.2L - Just got back from a 3,000 mile trip towing 5,500lb trailer from Oregon to New Mexico thru A LOT of mountainous (non-flat) travel. Used 'tow mode'.
I find that adaptive cruise control doesn't do very well to keep up with the set speed. I ran 1000s of miles at a 65mph - 70mph target speed setting but the slightest upgrade can see speed drop 5mph or more below the set speed when clearly (using manual foot pedal) I can cause it to jump up a gear to regain/maintain speed. As I mentioned in post above, when vehicles pass / merge in front this also causes speed drop and on long hills - it will not regain the target speed for a loooooooooooong time. And regular cruise doesn't show in heads-up.
Me - I find this really annoying / not-the-best design choice of GMC software as it could more aggressively shift gears to maintain speed. I mean, what's the point of 10 speeds if not used? And I'm sure it annoys people following as I am annoyed when following a vehicle that slows 3, 4, 5, 7 mph going up a hill. But... maybe my expectations are too hi? as my 2004 Cadillac SRX exactly maintains to speed (even when towing same trailer) and I'm used to this.
Just curious what others think.
P.S. Love the rig - towed 3,000miles without breaking a sweat / no issues at all with power/performance/ride
