For 15 € you can stay one night at the camperstop (1 Place, two people, no shower no toilet, no washing disches). Eletricity is a machine with coins.  You can not book this places only the campingground can be booked. Your Motorhome need to have a toilet on board. 

Plus the tax of Oberammergau 2,50 € per Person. Dog´s 2 € per night. It os only for one night.