I posted this on another site as well. I have decided that the F150 I have is just not going to cut it with the trailer I have. Have an opportunity to get a pretty good deal on some 2015 350 Super Du...
For that size the only reason to get diesel is if you drive an incredible number of miles or you want to appease your ego. Both are fully capable of towing your trailer.
You will be very hard pressed to get the $10k back in fuel savings if you are a typical RV'er.