There was nothing wrong with the ride on the outgoing generation, and GM hasn't messed things up here. It's still independent front/solid axle with multi-link out back. Magnetic Ride Control is available on the upper trim levels, and it makes things even better. The switch to electric power steering from hydraulic in the outgoing model is transparent -- it's dialed in very well, and is said to contribute to the improved fuel economy.
Towing capacity is decent at 8,000 lbs for the 4WD and 8,300 lbs for the 2WD - the lower figure for 4WD is a result of gross ratings, not a flaw in the operation of the system. All of the towing essentials are available, from integrated tow braking control to trailer sway control. I didn't get a chance to tow with the new SUV -- I hope to do that soon during a more extended testing period, so that I can report back.
The interiors of the SUVs have been much improved with higher quality materials and smart storage, power and connectivity options. There are at least 6 USB ports throughout the cabin, and up to 12 power ports, and you could spend all day counting the cup and bottle holders, cubbies and slots. Infotainment and rear seat entertainment systems are available and well-executed -- though I would have preferred headrest-mounted monitors rather than the single fold down screen that blocks the driver's rear-view mirror. As a minivan alternative, GM's full-size SUVs do a pretty good job of taking care of the passengers.
For serious towing, you'll probably still want to go for a heavy-duty pickup truck. But for maximum people moving and gear hauling, it's hard to beat GM's full-size SUVs. The other remaining full-size body-on-frame SUVs like the Nissan Armada, Toyota Sequoia, Ford Expedition and a few others, are all pretty long in the tooth by now, and they didn't make much of a dent in the GM dominance before. So, even as the full-size SUV slinks off the planet, it will be slinking with a proud GM nameplate.
It won't slink away quietly or cheaply. The Chevrolet Tahoe starts at $46,090 for an LS 2WD up to $62,995 for an LTZ 4WD. Suburban ratchets that up a few grand, starting at $48,295 for LS 2WD and $65,990 for LTZ 4WD. Add a few hundred dollars to the Chevy prices for the GMC version; Yukon Denali starts at $63,675 for 2WD and $66,675 for 4WD; Yukon XL Denali wins the race to the top with $66,375 (2WD) and $69,375 (4WD) base prices. And you can add accessories to push things way over the top, if you're so inclined.
I think GM has called it right, though. If you need a full-size, body-on-frame SUV, this is the place to come. It's not going to be cheap, because there's an awful lot of vehicle and technology on tap here. It may be that GM's full-size SUVs will be looked at as vehicles of need; not vehicles of desire -- and that's the way it probably should be. If you need a Tahoe, Suburban, Yukon or Yukon XL -- you should be able to buy one. If you simply want the biggest, most capable SUV money can buy, but you don't really need one, you'll probably go elsewhere.