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It looks like our van is a Partner or Berlingo like mine. I just cut a circle using my pipe tubes as a template with the sharp edges on a pair of pliers and it came off pretty easy.
I have a solid metal bulkhead and used a 4 inch hole saw and shoved a soil pipe through the hole, im assuming you could do similar with a pair of wire cutters, then shove the soil pipe through so the sharp ends dont damage the pole.