Cargo

cargo, n. 1. items for transport. 2. (gamerese) a character who is so big, so heavy, and so strong, that the party must arrange for special reinforced transportation for him/her/it. See also brick, tank. [ME]
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Addendum: This is from a GURPS Supers game I played in once. There was this one PC who had been surgically altered to a huge size. He weighed tons and didn't know his own strength, which was considerable. While forming our group and deciding on how we should get around we had to figure out what to do with "Billy". As we figured out the cost for a reinforced semi-truck we started jokingly referring to Billy as The Cargo. The name stuck. [ME]