Really nice dino rig purchased from the Creation Museum. The semi moves forward when the child begins to roll it forward and moves in reverse when the child begins to push backwards. The cab and trailer do detach from each other and are easy to hook back up. The back doors open and shut and my son is including 9 of his little dinosaurs that fit well in the back (they did not originally come with this set)The dinosaurs will be placed in the back of the trailer and the cab and trailer will be bubble wrapped and shipped in a padded package. All items come from a smoke-free, pet-free home.