denis 4x4 I thought the same thing back when my first motor home was tagged in So. Dakota.
However, shortly after getting used to having the out-of-state plates, I realized first off other than an accident most people who get stopped in any type of vehicle are for speeding, running a stop sign, reckless driving of some nature, etc. Most if not all of those are eliminated driving my rig because I drive much slower usually under the speed limit and I certainly drive more carefully and aware of my surroundings. Also, I believe most police officers have more pressings issues on their plates than where someone's RV is registered.
Crossing the border at the Peace Bridge going into Canada you are much more scrutinized by Border Patrol Agents than the everyday cop. Once I was asked why I had different plates than residence and all I said is I have dual residences.