Not sure if I have a problem or not searched the forum cant find any with same problem got a td5 w reg car sits level drives fine tows caravan great only problem when i climb on the roof rack to tie my kayak down every now and again (with the engine off) the car drops so the tow bar is just off the floor when i start it goes up everything fine again have i got a problem or is it just cos the compressor is not running and they all do that any help would be great