DSDP Don, you seem terribly smart for not even owning one of the motorhomes in question. If you have time to read LVRVLUVR's posts on irv2 Ford forum, go back and read my posts. Most threads include the word "downshifting" in the title. You will find that I was the first owner to definitively diagnose the tow haul feature on the 2016 F53 6 speed as nonfunctional. jharrell and several other owners confirmed my diagnosis. The purpose of this post is not to diagnose the problem, but to try to persuade Ford to acknowledge and fix it.
