This is our first trip down through France into Spain in a motorhome. We have always been 'tugging' before so it was a case of find an open caravan site and go for that. Now we have our motorhome we intend to take a more leisurely drive down to the south of Spain using a combination of Aires and sites as necessary. Having seen all the motorway Aires whilst travelling down I had not realised they were not a safe option for staying, having read bits I realise they aren't. So what are the basic security rules please for staying on Aires. Is it go for the busy ones? I seem to remember reading somewhere about not putting the Silver Screens on, is this true, if so why? We have an alarm fitted and a dog! May leave his bowls outside. Any advice as to does and don't would be very welcome.