So I made to Colorado from Washington towing the Chevy Aveo that was packed, my almost 10 year old 120k F150 with not a single hick up. I did replace Trans/rear diff/coolant/oil fluid along with a new oil/fuel filter. I know Ford builds them good but I did expect something to go wrong. The only thing is now I need to replace my breaks from all the breaking down hill.

 

Congrats on the tow, but as far as the breaks go, just downshift next time. Towing a 5000# down a 8% grade I just put her in 2nd and she coasts at 50-55 engine sits right about 2800-3000 and does all the work don't even touch the brakes.