Meaning of tandem trailer

tan'dem trail"er

Pronunciation: [key]
  1. Also calleda very long rig consisting of a tractor pulling two trailers hooked up one behind another.
  2. a semitrailer designed to be hooked up to another part of such a rig.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.