I go to all the ford dealers for work on a daily basis and I can tell you the ecoboost is bad ass! You can also get the F150 with the 6.2L motor or at least you used to, not sure if they still offer it but I know the ecoboost would pull a flat bed no problem. If you had a 20-24ft enclosed trailer it might struggle a little but should still be able to pull it. Just put airbags on the rear suspension so it'll stay more level.