When purchasing a hookup cable for camping, please ensure that it has some sort of  protection device with it.  i.e. a built in r.c.d. or some other form of overload protection for your own safety, as this item is used outside, do not rely on the campsite overload protection soley or the built in fuse on the plug.  Be careful of buying items I have seen on this site without the overload protection as these can be dangerous.  As a qualified electrician working within the camping and caravan industry I would go for the better ones, they maybe more expensive but are life savers not killers.