For all the people who don't like warm beer and camp on a site with electricity, do as I did. Get yourself over to 'Family Village', the shopping centre on the Mulsanne straight and get yourself one of these:
http://www.electrodepot.fr/refrigera...tt91a-bcw.html
I've bought it in 2011 and thusfar it has made the roundtrip to Antwerp and back to Le Mans every year without missing a beat.