TC newbie, can I get some input please?

The OP has stated, when the TC is loaded on the truck, the front and rear of the truck squats. Where is the argument as to where the COG is? If it were in the center of the rear axle, the front of the truck would raise a little. If the COG was behind the rear axle, the front of the truck would raise even higher. What am I missing here? Perhaps, I am putting too much into my teeter-totter experience.

Wayne