400 volt electric fence, seems, just "seems" to discourage people, easily worked from a 12 volt battery, there is however a 11,000 volt fence that you can get, once again from a 12 volt battery, that you know, with certainty! they won't be back!
People who wander around a camp site at night without a torch should expect greater calamities than tripping over an awning steady. After all how many tents have guy rope lights attached. Seems an unnecessary piece of kit to carry to me