Towing a 2640lb 16ft TT with a Ford Ranger 4.0L?

I had a wing on my Excursion that helped push he air up and over the trailer. I gained .5mpg by using it. I went from 7 to 7.5 just using th wing with no other changes. With a pickup truck you would have to have a cap on the bed so the wing can be mounted as close as possible to the trailer. Other wise just on the roof of the cab is to dpfar away. I found my wing on CL and paid $75 for it. It paid for itself on our first long trip. It was also adjustable which helps for directing air.