I was in a 2000 super duty 7.3 PSD with a tuner. This does darn near as good of a job, and in some ways better. Better in the mpg department and transmission strategy. Not quite as much power obviously but in a way its quicker. The creature comforts make up for anything I gave up in the power dept, which isn't much. I'm familiar with the 5.4 and 4.6 and to be honest I hate them both, which is why I had a diesel. Not poo pooing on anyones 5.4, but the new engines are why im back in an f150.
How did you find the 3.5 to pull the 7000 lb trailer in the hills? And what Ford if any did you pull with before? I am looking to haul a 7200 lb trailer and the 5.4 seems to lack some power. Still much better than the Chevy did.