Alex
I just did the same thing back in march. We upgraded to a new Jayco Eagle 314BDS with a dry weight @8000lbs witch I ran out of cargo capacity in my F150 Eco with max tow, so I got an F350 crew cab 6.2 gas with 3.73 rear. Like you I loved the ecoboost power and after towing all summer (@2000 miles) I am more than pleased with my 350 with power and especially handling the extra weight of the TT. It's a different power where you see the low end grunt of the Eco vs the top end power of the 6.2. We just traveled @800 miles from Pa to NC empty and I averaged @15.7 for the trip towing can range from 8.5-10.5. If you have any more direct question I would be glad to help you out.
Eric