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The problem with 4 cylinder engines over 2.5 liters is harmoinic oscillations, a rocking motion front to rear caused by the forces created by the first and last cylinders. Balance shafts are used to offset those forces.
The 2.3 ecoboost engine has plenty of power, especially with a dual clutch, 6 or more speed transmission. If you want to tow more than 5k then computer controls could prevent the transmission from using too high a gear.
The vast majority of pickups never see more than 5k towing. Why should they be limited to ancient engine designs that destroy potential mpg, when modern small displacement engine are pulling better than 100 hp per liter on 87 octane pump gas.
regards
mech
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