Was it worth the extra effort to develop a F-600 when it's practically identical to the 550?
I'll be shocked if this 10 speed isn't a problem area with anyone hauling weight in mountainous terrain.
100% worth the effort. Not a single other truck in the segment has a 22,000 GVWR, unless you feel like jumping in and out of and maneuvering a GM 5500/6500 or a cab forward truck.
The door tag it bears is going to be invaluable to fleets and fleet upfitters.