Registering Trailer in a State Other Than Actual Residency

Tell your friend to check out the state of Maine a lot of us in Maryland get or work trailer tags out of Maine for the same reason but Im not sure about travel Trailers. I have a friend who has a trucking business and all of his trailers are tagged in Maine. The tags are good for ten years and they send you a e-mail when they are close to running out. You can find the information on the net.