I'd be hardcore...
An Airstream park is for Airstreams, period. Now if a wayward SOB happens along in the middle of the night and needs to rest awhile, there should be a parking lot (ala Walmart), where they can rest for the evening before heading out on their merry way. I mean, it's the Airstream way...
out by noon...
What if an SOB tags along WITH an Airstream for a jaunt? First off, ask the Airstreamer if they know 'em or did they just end up following the 'Stream home? Again, refer to #1 above. Well, if they're truly associated with an Airstreamer, we can educate 'em as to the benefits and pride in ownership of an Airstream...
An Airstream park is more than just a place to park 'em. It's part of the ownership of an Airstream and everything that goes with it, not to mention the sharing of tricks, techniques and service issues particular with an A/S.
Maybe make 2 lists: one that is "Airstream Only" and the other "Airstream Friendly" (which includes most of the campgrounds in the US).
'Course, maybe it's not "Airstream Friendly", but rather "Airstream Envious"?