I’m not reading 4 pages of this stuff. Bottom line is yes you can tow a fifth wheel with the right F150 and a small enough trailer. My input would be that a HD truck doesn’t cost any or much more and is a more capable platform. I guess I don’t really see why you wouldn’t step up. But I also get that this is a sliding scale. I don’t like dually trucks so that’s where I draw the line. Others are willing to go all the way to MDT’s or beyond. Then there are the dudes rolling arriving in Subaru’s.
Whatever floats your boat I guess.