Champion aluminum radiator, new oe thermostat, new motorcraft water pump. Electrical gauge in over temp light port. At 55 mph it will hold 215-220. I am ok with that. Get the EGT's over 1000 for very long, and it shoots up to 230-235. I want that cooler. I also go camping up a mountain here nearby, it's about 800 foot climb over 3 miles. Got it up over 245 on that 2nd gear pull. Really didn't like that.
I am probably somewhere near 16,500 or 17,000 pulling the trailer. Truck scales near 8000, trailer weighs 7400 unloaded. Add the stuff and kids in the crew cab, etc...
They almost keep it cool, but I would be comfortable with a little more CFM.