Joovy Caboose Too Seat Greenie This accessory converts your tandem Caboose to a full double stroller in minutes. The Caboose Too seat installs easily onto the existing rear platform and stroller frame. It reclines and includes a 5 point harness, just like the front seat. The Caboose Too is a perfect solution for families looking for a compact double stroller and for those with children close in age. The Caboose Too seat offers additional support and comfort for children still too young to use the bench seat and the standing platform of the Caboose. This configuration offers the flexibility to use the seat until the older child reaches the point where they want to sit or stand on the back of the Caboose when independence kicks in and they are big enough to do so.