The Entry Door key has numerous different combinations. The PROBLEM, is simple, they do Make "master" keys for the doors, that are ONLY supposed to be available to RV dealer/service techs. But, some dealers, when they have NO door key or it is lost, give the customer the "master". They do NOT tell the rv'er it is a master. Until he tries it on another door with the same model lock assbly. Compartment door locks are all the same as long as the locks are the same brand/model. The DEADbolt, either the RV type or the household type will have hundreds of different keys and there are NO masters for those. Doug