If it's prewired for towing, that's a bonus. Any Ford dealership should be able to quote you a price for the Ford factory brake controller, installed. There may even be a cutout somewhere on your dash for placing it. The factory units aren't cheap, but they integrate nicely with the rest of the ECM/ECU software. I added one to my F150 a few years ago, and it took about an hour to install it, because the F150 was also tow ready.
Mike. Comments are anecdotal or personal opinions, and worth what you paid for them.
2018 (2017 Sprinter Cab Chassis) Navion24V + 2016 Wrangler JKU (sold @ ????)
2016 Sunstar 26HE, V10, 3V, 6 Speed (sold @ 4600 miles)
2002 Roadtrek C190P (sold @ 315,000kms)