A reasonable DOC fee is normal and expected with any purchase from a dealer, but should be the same regardless of what vehicle you buy, new and used. Reasonable in my area is in the $4-600 range. If your LFD normally charges $500 DOC for everything else on the lot and suddenly wants you to pay a $1500 DOC just because you got a Bronco, it's time to raise hell, file a complaint with the BBB if you have to, that's deceptive business practices.
FYI, it's not a "documentation" fee, it's Dealer Overhead Cost, it's what they use to pay the bills and keep the lights on. Overhead doesn't change based on vehicle model.
7/14/20 Res, took delivery 4/7/22!!
A51 2 door Badlands, 2.7L, Sasquatch, Lux, MGV, MIC, Roof Rails, Tow