I am told that the laws regarding innkeeper's rights are very very extensive, kinda one-sided, and a lot stronger than your run of the mill rental agreement laws. I don't think you can call it "his" room by any stretch of the imagination. The "expectation of privacy" is more like that in a college dorm room.
Beyond that I'm not commenting since it seems he was not completely angelic, although I certainly understand that he did not want to leave the guns in his truck. Also, given the antifahysteria new militia lately, I'd be tempted to take an extra gun or two with me, plus ammo, on a trip.
Terry