The rear frame is simply fitted in the footboard and with that the Rambler walking wagon is closed at the rear.
Ideal for families with twins, families with small children in age close to each other and also for host parents. With a child seat in the rear frame you create an extra comfortable seat. When little children have grown the rear frame can be detached and the footboard is ready for getting on and off again.
If you walk with older children that can already walk longer stretches you can use the walking wagon as luggage carrier. The rear frame then serves as closure of the rear end or for attaching the front bag.
Also families that mainly use the Rambler walking wagon for carrying luggage when making long hikes with the slightly older children, often opt for an arrangement of the Rambler walking wagon with rear frame. They then place the (front) bag to carry luggage in the rear frame of the Rambler walking wagon.