my 03 Quigley had 16's on it when I got it. also had a 285/75/16 spare in stock location. im guessing desert eagles Quigley had an updated front end which likely came with a newer f350 front axle that had larger brakes then my 03 f350 front axle.
keep in mind you cant just generalize a specific size rim wont fit. offset and rim design play a large part with caliper clearances.