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Once again this will vary from country to country but the types of things you need to think about include the width of roads and the passable width of any gates. Emergency vehicles will need to turn around when they exit the campsite; the 'turning circle' of a fire fighting vehicle is not small. It is worth talking to the local fire-fighting agency to find out what is required for the larger fire-fighting emergency vehicles. At the same time, get any oil or gas fuel tanks checked over and ensure any required permits are in place. Don't assume that the existing owner has ticked all the boxes - the authorities will not excuse any serious omission on your part, on account of the conduct of the previous owner. In many countries, businesses pay higher rates for services than private homes.
Learn what the local rules or regulations demand. Find out what your obligations are in terms of simple First Aid and public fire-fighting equipment and training. Check out what local taxes or fees you may be eligible for.