MotorWeek is in Detroit for the reveal of the all-new 2021 Chevrolet Tahoe (left above) and Suburban (right above).  Both SUV’s have new and more refined interior and exterior designs.  From the outside, GM says everything is new except the windshield.  Inside, the steering wheel is all that carries over from the previous generation.2020 will mark the 85th year of family hauling for the Suburban.  The Tahoe will have been on the road for a quarter of a century. Both full size SUV’s grow for this new generation as they prepare to fight Ford's redesigned Expedition, and the upcoming Jeep Wagoneer.  The Suburban’s wheelbase increases 4.1 inches, while becoming 1.3 inches longer.  Second row legroom is extended by 2.3 inches.  For the Tahoe, wheelbase measurements increase by 4.9 inches and overall length is up by 6.7 inches.  Tahoe third row legroom is extended by an impressive 10.1 inches.  There’s also more cargo room in both.  The all-new chassis not only adds room, but also an independent multilink rear suspension. There is plenty of tech in both including a dash-top 10-inch touch screen, the largest in its segment so far. There are three engine options: a 355 hp 5.3-liter V-8, a 420 hp 6.2-liter V-8, and the 277 hp 3.0-liter I-6 Turbo-Diesel recently introduced in the Silverado 1500.  A 10-speed automatic handles shifting duties for all three engines.Along with the brawn, there’s more brains.  The all-new electrical architecture can process 5 times more data than the existing electronics.  The faster processing power supports 30 standard and available safety and driver assistance features on both SUVs.  The digital vehicle platform also powers the optional air suspension.  It’s now available on both front and rear wheels.  The Air Ride Adaptive Suspension and Magnetic Ride Control top the list of the three suspension choices.  We experienced the sophisticated set up at GM’s Milford Proving Ground, riding along with a professional driver behind the wheel of the brand new Tahoe equipped with the Air Ride Adaptive Suspension and Magnetic Ride Control.  This big SUV easily absorbed bumps between 30 and 50 mph, and quickly settled back into a smooth and comfortable ride.  It remained composed through the curves.  Sport mode added the usual firmness with comfort and control. Eventually sharing a chassis with an also all-new GMC Yukon and Cadillac Escalade, the 2021 Chevrolet Suburban and Tahoe will be built at the Arlington, Texas plant, and go on sale in the U.S. the middle of 2020.