I go abroad a lot and many sites only have 6/10amps. Out of season there are lots of empty pitches and the site owners are happy if I use two hook ups, some charge extra some don't. At the moment I use a separate lead into the van for the extras' I don't then have to turn things off and on if I use the kettle, central heating etc. Is there a way you can join the two inputs through the vans control box, or is it just a case of having to keep using the extension lead?