I am thinking of trading my 33' Everest for a 38' Bighorn. Going from 10500 lbs to 12400 lbs. I am concerned about my 08 F250 being enough truck for the new fiver. Hitch wt. 2500 lbs. GWVR 16000 lbs. Sales people say that the F250 will be plenty, I'm not sure. Need feedback. Thanks