Ok a real newbie question. We have not used our van just on battery/ gas etc. Thinking of joining the Shepton Mallet Rally and wondered would the battery last the weekend? Fridge i assume would have to go onto gas, but not sure whether i need electric. I phoned them up and it was £25 for the weekend, which seems a bit steep. They do have toilets and showers available. We would only be coming from friday eve till Sunday morning.