That is strange. I looked up the same ball (I think) on SD Truck's site and the only limitations there are the Raptor and Limited. Not sure why on either of those. Here is their description:
B&W Turnover Ball Gooseneck Hitch
Vehicle Applications
- Years:2015, 2016, 2017, 2018, 2019, 2020
- Model: Ford F-150 (Excludes Raptor and 2019 Limited)
I am aware it is crowded under the bed of the diesel with all the EPA mandated exhaust devices and plumbing. It will be interesting to see what you find out. By the way, SD trucks is easy to call with the question but I bet the technician on their end wouldn't have a clue.