Recently was towing 8000lbs myself, in my gasser. As always, it did fine. Seemed comfortable with it.
The diesel is a completely different truck IMHO. If I was big time RV’n guy, I’d have one. And some times I still miss it when my truck is loaded down.
But for me, dealing with DEF and all the system complexities is why I chose my simple 6 speed gas pickup.
As far as Eco Boost… Incredible power. My friend blew up his. But to be honest, he ran it really hard. He swapped the motor and wasn’t mad. In fact can’t get him to bad mouth that motor.