I tow a 5,150# 28' trailer (dry) that is about 6,500# loaded and wet.
I towed with an Expedition for 3 years and knew it would be the death of my truck. It had the 5.4 Triton with 300 HP, absolutely identical to the F150 drivetrain. 9,000# towing capacity and 3.73 gears. A towing beast, but it wasn't enough.
I was on trasmission #2 and was nursing a bad cam phaser on the passenger's side when the 'tick' got to be too much to bear.
I looked at 1/2 tons, but could not fathom getting into yet another truck that just wasn't up to the task.
I'm now towing with a F250 with 6.7L Diesel. You guys can talk all you want about the EcoBoost, it is NOT a Diesel.
I will say that I tow a lot in the mountains and the Expy was hating life on hills. Towing flat to the beach was tolerable, but now I'm towing however fast I want, wherever I want. Not only am I good with the engine, but I don't have to worry about the transmission either.
Look at the prices, too. It isn't that massive of a jump to the 3/4 ton. And you get SOOOOOO much more truck. Mine is my daily driver, too, and I couldn't be happier. I get a solid 20 MPG on the interstate, 16 MPG around town, and 12 MPG in mountain towing. Pretty awesome stuff for such a capable truck.