Actually there are "new" Excursions being made--just on the Ford 250, 350 and 450 truck chassis. But these are custom after market units. You buy your choice of a new Ford X50, and for another $23,000 there are several outfits which will graft on the back of a 2005 excursion. Total cost starts at about $53,500, on up!
Part of my post about the newer Ford engines was based on a conversation with a fellow at a truck stop a few days ago. He claimed that he was getting 14 mpg with a 2011 Ford 350 4 x 4 heavy duty towing a trailer weight about 13,000 lbs--and had put over 35,000 miles on that specific truck in a year.
He had blown the engine on a 2009 in less than 30,000 miles. The down side of our conversation is that it took him almost half an hour to fill the DEF (Diesel Exhaust Fluid--urea) tank on the truck! And I had picked that lane to fuel--of course a pickup will fill faster than on the road tractors....two in each lane, while this guy tried to fill the DEF tank.
If you really want a "hauler" there are all sorts of custom/semi custom trucks built from what appear to Peterbuilt, etc, with an extended sleeper, on up to various trucks with 4 doors, and a lot of space plus over 400 hp and torque up into the 1200 plus range--again all you need is $$. There are also a number of the on the road tractors, which have an extended sleeper which can be from 90 up to 230" long, and include shower, dinette, galley, full bunks etc, and are sold at about 500,000 miles. I have seen these for less than $30,000!