I can understand why they might question Calif plates on one vehicle and Montana on the other, but why would they stop someone just because they have Montana plates on both vehicles? Would that not be profiling? I am aware of the ramifications of being a resident of Calif and licensing out of Montana, but if both vehicles are licensed, then what would be their reason? I suppose you could argue that there is always something they can get you to stop for and of course then they automatically ask for Lic & registration.