Hi, we're heading to the south of France this summer and i expect the pitches will be very sandy as we're close to the beach. Our set up will be 7.9m caravan plus 4m roll-out canopy, we're hoping not to put up the awning 'tent' that fits under the canopy to keep the heat levels down. We currently use our old 3.5m groundsheet (came with Kampa air awning, one of their 'carpets') but I'm thinking we'll benefit from a much larger groundsheet, perhaps nearly as long as the caravan? Are there different types of groundsheet? If so what would be the best for that terrain? And should be go larger for the groundsheet? Any advice appreciated, thanks.