hi rafiki ,i have used a roof tent on a vw van and now i use it on a mazda bongo tintop .i also have and still do pull a tear drop caravan behind as well .have never been turned off an aire or ever had anything said to me about it. i also park my mini artic outfit on aires .nobody cares what you have (in france).i also knock around with landrover friends lots have roof tents .mine is the actual tent shown on brownchurches white landrover ,they took it off that and made a fitting for the vw. that was about 98 .that long ago. i have put up small tents when travelling on m,bikes in france .the campers say park in here then offer to keep an eye on it if you go to a bar.
life is different over there rules are for breaking over there.
cheers alan.