Brand new van, third time out. About to leave the pitch last weekend. "Tyre looks a bit low" moved it a bit , huge great nail in the tread. As we had never changed a caravan wheel before, Daryll the warden at the CC site provided invaluable assistance. (OK we are total idiots, he soon sussed this and did it for us). Anyway on arriving home I decided to read the caravan handbook on this subject (are these handbooks badly translated from Chinese?). It said, in bold print, the caravan and car must be hitched together before jacking up the caravan. First, ours wasn't, we were still,on the pitch, have we done irreperable damage? Second that seems counter-intuitive, why do they neeed to be hitched together?