We are in the process of buying a new caravan. We need to keep our van in storage & were looking at maybe buying a cover. I have heard comments about covers damaging the bodywork &/or scratching the windows. I would appreciate any comments/thoughts regarding the use of covers. I realise that they have to be breathable, but I have been quoted prices ranging from £80-£350 - what's the differance/what type of cover should I be looking for?