Remember that camping on site using a 230V electricity supply within caravans, motorhomes requires even more care than in the home. Because your unit is mobile there is a greater likelihood of things going wrong with an electrical installation than with the fixed installation within your house. It is therefore important you make sure your cables and equipment are maintained in good condition by simple checks every time you use it, by regular inspections by a qualified technician and also by using it in a sensible way.
It is good practice to check the operation of the safety RCD device before turning on your appliances by switching on the RCD and pressing the test button. If it fails to operate the system will need to be checked by a suitably qualified person.