I just come back from Las Vegas, where I park my dually in underground garages.
Even it does look scary, the F350 is lower than 6-6" most of the garages have.
My camper shell in the rear stands higher with empty truck and that was scratching the entrance warning bars, but never had problem parking in the garage.
I have more problems with turns as my long base truck sucks in this matter, but height and width is seldom a problem in parking.
Just learn how to back up into spaces as front parking is impossible even at Home Depot Pro Parking.
Takes like 8-points turn to get rear wheels between the lines if you want to go front first.