If you don't know, then you have never driven an overloaded vehicle. For those of us who have, we know the feeling of vague steering and unexpected sway associated with too much load. His "Heavy Half" was not one of the true HD models that do have a gvwr over 8,000 pounds. His is more like 7,400 pounds. I will break it down even more for you. He felt unsafe because the vehicle did not handle properly. His lack of comfort came from the tension required to keep the rig headed in the right general direction. Not fun is often used to describe it. I hope that explains it.