Our caravan is a Lunar LX 2000 and we have a Sunncamp prestige awning. Despite several attempts we can not get the awning correctly tensioned to prevent water from pooling on the roof. This has already led to the awning collapsing and damaging some poles. The van is on a pitch that slopes along the length of the van and to level the van the back end is close to the ground. When the awning is set up water always pools on the roof at the top of the slope. Any help anyone can give would be great