We have a 2007 f250 with 7" lift 36" 15.5s atz pulls our Dutchmen 2012 voltage V3900..43'7" 16k dry 20K with the toys.. pulled thousands of miles no problems at all.. gets 10ish mpg.. when my wife drives..lol
I don't think you will have any problem.. we do have rear lift springs so that helps...