Found another possible solution at 2009 Ford Escape Dinghy – Flat Towing Problems | Malia's Miles Blog
scroll way down to Thomas J. Brown Jr. both coments. He installed a 10 inch Hayden cooling fan blowing down on transmission while towing, powered by motorhome. I talked to Brown on the phone and he is most helpful, explained the 10 inch fan lays on the transmission dipstick and cables attached by one tywrap so you just rotate the fan up to check fluid level.
Quotes from Brown
:Hello all, just wanted to let everyone know that I completed over 3000 miles roundtrip from Killeen/Fort Hood to St. Louis Mo., through the mountains in West Va. and finally on to Bedford Va. and back in blistering temperatures and towing most of the time at the 65 mph max. towing speed and I had absolutely zero problems!!!!!!!!!! The Hayden cooling fan works flawlessly and it fits like it came from the factory that way (maybe it should have). "
"This is the longest I have ever gone on a transmission when flat towing. This latest trip, I consider to be the ultimate test since it was almost done exclusively in triple digit heat!!!!! "
I think I want to use aj30909's transmission gauge and Brown's cooling fan as the best protection from burning up my 3th transmission.