Re: 2009 Escape trailer and towing
I know they all have the transmission cooler. You can add a secondary cooler in series if you are concerned about over heating the ATF, or replace the factory unit with a larger one.
I would think that a dealer could look up the part numbers for replacement relays without much difficulty. Ask for relays for the trailer towing package. If you get the factory replacements, do not install all of them if they are sealed in plastic until you verify that they will work and the rest of the harness is in place. If you do not open them, you may be able to return unopened packages. Once opened, they are yours...
Rockauto has a trailer towing harness for ~$80:
FORD Part # 5L8Z15A416AA
Kit Includes Installation Instructions, Wiring Harness & Converter (Only 1 Remaining)
So, maybe they do not include all the wiring. Rock also has a kit to add to the factory wiring from a company named "Curt" that has a circuit board, instructions, etc. I would be surprised if all vehicles had the extra wiring.