The Ford 3.5 EcoBoost conversation, and the claims made for it, always amuse me. From those that are the "true believers" you would think it is the strongest engine in the world and bulletproof. Strangely, Ford offers no 3.5 EcoBoost pkg. in any HD truck in any form that I find....hmmm, so I'm not thinking they're worried about the engine itself taking away HD customers; maybe the "package" just doesn't measure up to an HD??
If you notice any truck meant for heavy towing, for long miles, has a "stout" engine; not an overly aspirated, small, V6 cylinder. Granted there are diesel 6 cylinders but they are nothing like the gas ecoboost. So, I'm thinking that those that love them can love them....until they need an actual HD truck, OR, that turbo(s) shell out and you have to pull 8k out of our pocket because you were trying to use it for something it wasn't meant for....
JMO/YMMV