Simplest solution is to carry a soft electric guitar bag around with you and whenever you go to the supermarket/take a crap/go to dinner you throw your rifle in the guitar bag and sling it over your shoulder. Anyone who asks the question, answer is "im travelling around the country in a camper with my guitar and I dont want to leave it unattended" The only downfall will be if you get someone into guitars who wants to see what you have.
I have done this a lot over the years, travelling on buses, ferrys and trains with zero problems. I would be making sure bolt and ammo were not with me.
Electric guitars are similar enough in weight/shape to an average rifle that it looks pretty convincing.
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