Further to Gilles' info, we rent a motorhome (camping car) from an establishment not 20 minutes from the circuit. Works for us, because we are coming in from overseas and are not young or robust enough to sleep in a rental car or a waterlogged tent anymore. The convenience and luxury of a private shower and shitter cannot be valued in mere Euros. For a 4 berth vehicle cost worked out at about 600 Euros, collect Friday, return Monday. It is worth every last centime.
Will supply details, if requested