We used our ramp to level the caravan recently and it was still not high enough. We noticed some other caravanners had small yellow blocks, about 6 inches square that from a distance looked a bit like large lego pieces. They were about an inch thick and they were used like small steps. The advantage being that you could build up the height. These seemed like a really good idea to us and we didn't ask where they had got them from expecting to find them in the Towsure or Fiamma catalogue. Not so - does anybody know where we can get some from and are they as good as they look? Please help.