I have my permit for Oregon, and hardly ever do. I wish I could carry in CA and WA. I do lots of trips up and down I-5 at night.
I-5 is somewhat famous for the random killing that happen along it. At least I am not a teenage runaway prostitute. I think scary looking guys on dirty adventure touring bikes are less at risk of getting killed by psycho's. I hope.
As far as long guns, Oregon law says that they can not be concealed. So, no matter how well you have hid it, it is not considered a concealed weapon. IE, 12 gauge pump (loaded) in a riffle bag on my divider net in the Jeep is legal. It is not considered a concealed weapon because I have to get out of the Jeep to retrieve it. A loaded rifle or handgun i plain sight in a vehicle is also OK here as long as you are in the vehicle with it.