Ultimately what I do depends on how it feels to me at the time, if it doesn't feel right I don't do it and I always err on the side of caution. As I said previously in certain circumstances I HAVE got the chairs out and analysing what's going on in my head I think it often boils down to this:
Am I the only one putting out chairs?
I certainly wont be the first to do so but if a couple of CARS have already put out chairs then I'll feel more comfortable following suit. HOWEVER IF there's a couple of motorhomes that have already put out chairs then I'll be more likely to refrain. It really depends on 'the feel'.
Cars can get away with it, I know that's not fair but it's a fact so therefore:
A motorhomer joining in with cars isn't perceived as bad or as bad as one/many motorhomes exclusively putting out chairs etc because when they do it's easy to perceive their actions as 'turning the place into a campsite'.
We stopped in Hunstanton along Cliff parade, Like this guy!
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We too felt it would be nice to eat out lunch on the grass BUT it didn't fell right so we stayed in the van with the woosh bang open. After a couple of mins a car drew up just a few yards away, they got a windbreak out, chairs, small table and set up for their lunch. Getting OUR chairs out now felt fine now we were accompanied with a car, daft but suddenly more acceptable to us and the locals I feel?