Just bought a Valley Stow a Ball Gooseneck hitch for my 05 crew cab s/b, i can either mount it directly over the axle, or 4inches in front of the axle. How much difference in towing habits does this 4 inches really make? I will prob be towing 14 or 15K fairly regularly, with the odd 20k haul around the farm. My other concern is the trailer hittin the cab, if someday i decide to be a 5th wheel camper.