2012 F150 with 30' International Serenity
We tow our 2015 30' International Serenity with a 2012 F150 ecoboost. Have never had any problems with the setup, lots of power for hills and headwinds here on the prairies. We go to Arizona for the winter, so do experience mountains, and again no problems.
We use an EazLift hitch with 1000 lb bars and two sway controls. The EazLift does a great job, truck and trailer ride level and no sway.
Hope this helps.
Malcolm & Randy
WBCCI # 12523