A three-quarter ton Expedition is not on the books. It should also be noted that GM's Chevrolet/GMC brands have opted to "discontinue sale" on their Suburban 2500 and Yukon XL 2500 to consumers, for the foreseeable future.
They have been limited to fleet and government sales only. To buy them, they must be ordered by fleet companies or government agencies. The average consumer will not be able to buy a 2500 unit new anymore.
Half-ton construction and technology has progressed to where current half-tons tow and haul what older three-quarter tons could 10 years ago, and one-tons could 20 years ago.
The current Expedition (U324) tows up to 9,200 lbs (4.6 tons) of braked trailer. The Excursion (UW137) when first introduced in 2000 was rated for only 10,000 lbs of braked trailer in its best configuration. So the current Expedition is knocking on the Excursion’s door.
The Expedition already has larger heavier-duty disc brakes than the Excursion had, with larger swept area and larger disc diameter.
The next Expedition is expected to push beyond 9,200 lbs and into 10,000 lb braked trailer territory.