I have been pretty happy with my 2010 F150. It has taken us across the country, with little issue towing a 7400# trailer. The issues started this year. The pinion seal has been replaced three times...
Seems like very few people order the HD version of the F150. The Max Tow package by itself is not it, maybe they call it the Max Payload for 2015? It came with the towing mirrors, beefier springs, 7 lug wheels, and some more stuff. You're most of the way there, with the 3.5 Eco and 6.5 bed. Should be a real nice truck.
Wish I could get another A plan. It saved me almost $11K on my 2005 F250 diesel.