For various reasons we have not used our caravan for well over a year now of which that time its been in storage. The tyres have been on all that time and the van has not been moved once, so is it advisable to change the tyres before we start taking the van out again or would these existing tyres be ok. I think I heard from somewhere along the line that they can warp if stood still for a long time. Also is there anything else I should bear in mind before towing my caravan again. The van is only 4 years old. Thanks.