Are We Allowed to have a gun in an RV for protection?

I have a Pa carry permit that all states honor with the exception of MD and SC when we travel to Fl for the winters. When traveling thru those states I make sure the firearm is not in my access while driving. Amazing thing is that in some states it is legal to carry open but not concealed. I would't mind carrying open but unfortunately it freaks to many people out who are not use to being around firearms. As far as in my RV, I have at hand something other than a pistol.