99 f250 7.3 here. 99 f350 dually former work truck. Love the truck.
Only complaints
They eat front end components yearly alignments are several hundred dollars.
Rides like a work truck until you put 800# + in it.
Everything you "feel" an issue it feels like the drivers wheel even if it's the passenger or rear wheels all the vibrations feel like left front. Had me chasing my tail more than once.
18 qt oil change.
I have a transition year. Adds some oddities.

18 mpg average no mods not towing. 14.5 city up to 22 highway
10 mpg towing a big heavy trailer.

Only mods are one size larger tire trailer brake control and a 4 pillar pod.