My thoughts.... My 43' T2000 conversion has 7 1/2 feet of over hang behind the rear air bags that would be considered cantilevered. I pull a 23k lb trailer that is exceptionally nose heavy 4,300 lbs on the ball. I get a little bit of deflection in the frame rails when loaded in relationship to the camper box that is u bolted to it. (I wish I would have double framed mine) I would imagine yours is double framed as all the professional conversions I have seen done are and wouldn't think twice about adding one to yours for your smart car.
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