"They" have made them, Ford and GM both. 2500 series Suburban production lasted until 2013. I'm not sure when it started, 1980's I guess, maybe the '70s.
Ford made the Excursion from 2000 to 2005.
The best tow rating for a 2500 Suburban will be a 2001 thru 2007 model with the 8.1L big block, these were rated up to 12,000 pounds. Newer ones (like my 2009) are only rated for a bit over 9,000 pounds. My 2500 Suburban does a great job towing my 6,500 pound boat with up to 7 people and their gear riding inside the vehicle.