I try to look at the situation in a personal way. I am a veterinarian. I went to school for 7 years, had to pass the state board, had a veterinary clinic, had to have a state license which required 20 hours of continuing education each year, had to have a city and county licenses, had to pay federal, state, county and city tax, had to pay my employees and had to pay insurance. If some joker who never went to vet. school started treating animals in the local Walmart parking lot... Yes I would be very upset. I can see why the local campgrounds would not be very happy if campers started to "camp" over night at Walmart..
On the other hand, I didn't charge for a full yearly exam when I only gave a rabies vaccination. Would be nice if CG had some in and out over night parking spots. If I didn't use your water, electricity, dump, shower, swimming pool, TV, WIFI...etc. why would I pay for the "yearly exam"?