My suction pads have arrived today and seem to be of a decent quality, there is a significant difference in these to the Kampa version, with the Kampa suckers the suction is increased by tightening the screw which pulls the sucker to give it a greater hold, I can only assume that as the suction increases this could possibly be the cause of the marking problem though I’d be surprised if enough suction would be there to cause any damage, the suction pads I’ve had delivered today work by simply pushing the sucker flat and that makes it stay in place, whether enough suction will be created to keep the awning tight against the caravan or for me to use it to keep my rain cover in place only trying them will decide, as I said they seem good quality and I will find out when I try them.
BP