I've seen a few of those... and the whole engineering is just appalling. Cut frame in half. Weld in some box sections. Extend everything that goes backwards. Then put in a bunch of flimsy body sections. Load it up with another 1500 - 2000 pounds of frame, bodywork, interior, tv's, bar's... and you Excursion goes from 7200 lbs to 9200 pounds.
Now add 18 passengers... (17 party goers and apparently a driver) Even assuming there were no fatbodies there... at an average weight theses days of, say, 150 for men and women... is another 3K lbs. So you 12200 lbs or so... on brakes and suspension made for far less. And it's a limo. Those things are maintained like crap... especially when they get out into rural limo companies that buy them for nothing... and run them to death.
Now an Excursion in stock form... well-maintained.... will tow 10K lbs pretty easily. I used to have a V10 Excursion and towed antique cars with it a lot. Loved it. But brakes were notorious for failing/warping because they were over-stressed in stock form. And mine was less than 50K miles and lovingly maintained... including added aftermarket vented rotors which cured most of the brake problems. But the trailer had load levelers and it had its own brakes!!!!
Take a re-engineered limo... barely maintained. Totally ruin the structural integrity. Fill it with people... probably not belted. So as soon as things go tits-up, the load starts shifting around and causing worse problems. Gas tank(s) that are now barely protected....
Deathtraps.
But, probably the lowest bidder to look cool in a stretch POS. Sad. A lesson, too. Don't ride in those things!
Of course, I am sure there will be 'legislative' fixes that will screw anyone with an HD truck... farmers, car-haulers, etc. Because they'll look at this as an opportunity to go after everything but Tesla's and Prius's.
Sirhr