OH my! Gun laws vary so much state to state and even city to city. To compound the problem, case law confuses and merges a persons home (the RV) with a motor vehicle which different rules sometimes apply.
Before you embark on carrying a gun in your RV, you should do your own due diligence and research the matter yourself to your satisfaction. Relying on any internet forum for information where a mistake could land you in jail with your motor vehicle confiscated is just not wise.