I feel somewhat obligated to reply to this old thread as it such an important subject. It took me a while to figure out that my Tow/Haul was not working and it would not surprise me to know that others with F53s prior to 2016 are having the same issue. The difference is so dramatic that I know feel a bit foolish that is took me so long to convince myself that there was a problem.
My experience was similar to others in that I had to drive over 200 miles to a Ford dealer who would work on a Class A motorhome. It seems most Ford dealers, even commercial Ford truck dealers, will not work on motorhomes. When I finally found a dealer that would do the work and they warned that it my be weeks before they could get to my rig. It ended up that they called me the next day to tell me it was ready for pickup.
If you are in the Pacific Northwest, Northside Ford in Portland seems to the the place to go for Ford service on your Class A F53.
Thanks again to those who figured this out.
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