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If the frontal area consideration for towing is the frontal area of the trailer minus the frontal area of the truck I am in the zone of roughly a net 60 sq ft. With a boat tail I would think this situation would be even better. Most box trailers have a horrific wake area and only a few of them have under body paneling which our Keystone does have. We in fact have roof taper so the wake area without a boat tail is roughly 64 sq ft. My truck has the proper gearing, a heavy duty tow package, and extra cooling.
The most I will be towing is around 2,000 miles a year with one 4,000 mile trip planned in a few years. So far without a boat tail I have only towed a maximum of 220 miles on one overnight camping trip. I have not seen any overheating issues which I think is a good indicator you are over working the vehicle beyond it's capacity unless you are having actual problems with your cooling system. I talked to one Ford F-150 Eco Boost owner at a gas station who was having cooling issues towing a larger plywood box on a trailer and it only occurred to me later he might not have had the enhanced cooling package. He was towing a aerodynamic nightmare.
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