When talking about how your old Dodge towed, I would look at the tires (and bet they were not LT).  Your driving experience seems to sound more like they were the culprit than the suspension.
I would do a LOT more research before I would believe that the EcoBoost will average 20 MPG in everyday/overall driving.  You are setting yourself up for disappointment.
Personally, I think all of the Big 3 150/1500s are great trucks.  With the right expectations.  They are not going to get great economy, and they are not going to tow as well as a 250/2500.