Yeah, I'm not convinced either, though I just measured mine. From the bottom of the fender flare, directly over the hub center, I got 22 1/8th in. on the driver's side and 22 1/4 in. on the passenger side. Based on this, at least on my passenger side, there is about 1/2" between your truck and mine.
I also wonder how much space there is between the fender flare and the bottom of the fender sheet metal with the body colored flares vs painted ones. They aren't the same fender, there could be some discrepancy there. Keep that in mind with ORP trucks if they don't have fender flares.