Only three things can support a hanger: skin, head, or the “internals.”
Skin is fairly self-explanatory. Some might say, “Hey dude, I’m hanging 30 pounds, look at me!,” as if that’s a point of pride. Try plucking up the skin behind the hanger. It should be relatively loose all around. If it is taut it is supporting part of the load. Note that at times during a hanging regimen, skin may be stretched intentionally, the purpose being to create enough slack so the hanger can later be attached in a way to avoid skin support.
The head. In general, pressure in the head shouldn’t be supporting very much weight, though it can help a little.
The “internals” are where you want the majority of the load. The “stopper” at the end of the hanger is the blood-filled ends of the CC’s.