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I'm waiting for the mpg test.
Ii you tow a trailer you may compare the torque added because of the additional length. Easily 1000 N of weight in 0.4 m length (from fixation to pivot point) of the normal towing make 400Nm of torque on chasis/towing fixation.
But be aware that 1000N of weight exerted 1.2 m length will make 1200 Nm, you will need to absorve 3 times more torque in chasis/towing fixation. Some additional welding of vertical bars will be needed or you will discover, that weldings are strong enough to transmit forces and torques capable of destructing next object.
o=======x
adding a vertical force in x will tend to rotate with center in o, so flexing the tow bar.
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o======x
adding a Force to x will rotate with center o only if welded reinforcements elongate sufficient to allow flexing the towing bar.
In spain a modification like yours needs an engeenering project and lots of burocracy to legallize and homologate in ITV and Miniesterio de Industria, it could be done but I suspect in USA there are differents regulations. Rear suspension will suffer also if towing a trailer means adding vertical weight to the joint. Also, lateral forces in joint will make lose sooner the stability of the rear end (that is the whole).
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