Ok, it says consider the effect of the trailer's weight. Good idea. On a 3600 lb car with the rear bumper and hitch ball so close to the rear axle, it seems to me a light trailer isn't likely to hurt the car structurally. Monitoring energy use could show how much the increased wind resistance stresses the drive components. That leaves braking capacity as an unknown variable. With both regenerative and manual brakes available and scaled for the car's GVW, it seems that staying under that GVW for the car/trailer combined weight shouldn't hurt anything.the manual ... just said not designed or intended. But it does have a towing section that says pleas load over the axle.
So, even in the manual it shows that it can.
Not designed or intended does not mean DO NOT or CAN NOT.
Page 199 and 246 of the manual...
6. If your vehicle will be TOWING...