Reading the rules honestly seems like such a wase of time. They are constantly changing and mostly counter intuitive. THus brings me to why i am here.
Can characters with toughness or the other damage reducing defenses use carry and not suffer damage?

"Carry?" Do you mean the Passenger Feat?

Pushing damage is never reduced by Toughness, Invulnerbility or Imperviousness. This rule has *never* changed.

If this isn't what you're talking about, I don't understand your question.