If you measure the height to get it level with no weight on the ball, then as ScrubJay says, the measurement wil be wrong as soon as you put weight on the ball and the truck settles. And if you put weight in the bed of the truck, or passengers in the back seat, it will increase the error.
The amount of settling depends on how soft ("comfy") the suspension is in your truck, of course, so there is no standard measurement.
Most weight-distributing hitches have an adjustable-height ball, so you'll be able to level it by actually hitching up the TM, putting some dummy weight like cement blocks in the truck bed, and choosing the ball height.
Actually, the Eco-Boost SuperCrew Short Bed has a pretty decent towing capacity, as long as you ordered the factory tow package. It depends largely on the rear axle ratio, but it is possible that as long as you load reasonably, you could get away without a WDH. All other comments still apply.
Bill
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