Howdy and welcome gibby72 and Viewusa!
My best advice is to configure a signature in your profile and include your actual name and rig information. Many of us would prefer to have some idea who we are talking to (and about, for the rig). Then, jump in - start participating!
I've seen small signs at campsites that indicate visitors are welcome - these seem to work (from my observations).
What kind of "being alone while RVing" comments are you looking? I'm a solo full-timer and love finding the quietest and most isolated places possible (which is a bit of a challenge with a huge DP). Everyone is different, of course, so everyone does it differently.