Just received the latest subscriber edition of Practical Caravan and the article on breakdown cover caught my eye. It might be a "staged" situation but the main photo shows what looks like an RAC chap completing a wheel change. Except that he's using a trolley jack (not in itself a problem if used properly) but it appears to be jacking up on the chassis and also sitting on a chipped stone surface. The caravan isn't attached to a towcar but at least the steadys are down to help keep the van from moving. Not the best demonstration on how to do it.