newfhouse
Resolutely on topic
Firstly, because refuelling with petrol/diesel takes 2-5 minutes at most from empty to full, while for an EV it takes 20 minutes minimum.
Secondly, installation of EV charge points are a few thousand pounds each at most, while installing fuel tanks is hundreds of thousands at minimum, then you have to keep refilling the tanks, and all the associated rules and regulations regarding selling of fuel (and most filing stations make very little profit on the actual fuel sales, most of it comes form ancillaries).
So basically, the cost of providing petrol & diesel on site is out of all proportion to the benefits, while charging points for EVs aren't.
Of course there are technical and financial differences between refuelling options, but so what? Why should there be any expectation that sites will offer refuelling at all? If they see a business case for doing so, I’m sure some will.
The point I was answering seemed to be that the lack of (fast) charging facilities on campsites was a particular disadvantage of electric vehicles but as others have said, trickle charging will be possible in many cases.