@third rail posted:You can purchase a KADEE 819 extended draft gear box. ($4.99 at TrainZ). That way the draft gear will be attached to the body of the caboose.
This is a better idea. I would first determine if a spacer is needed and how thick. Make the spacer out of styrene wider than the gearbox so you can drill and tap holes. Even if the 819 will locate the holes under the body, the deeper the hole will allow more threads for a secure attachment. You may not need any adhesive but JB Kwick would be plenty strong here.
Pete