The Phillips head screws are usually a give away in an RV application as being part of something aftermarket. There are a few exceptions, but almost all the OEM screws you find in an RV will be square drive.
2017 Jay Feather 7 22BHM Baja/Andersen WD
2018 F150 4x4 3.5L Ecoboost Max Tow
2015 MB Sprinter 2500 Passenger 2.1L Diesel
2007 Ram 2500 4x4 Cummins 5.9L G56