Just an update which may help others who want to use a service pitch, my friend who has a wobbly white box said that generally you need waste pipe approximately 1.5 times the length of your van. I have used 7m, if I had gone nose in it would have been more than enough, however as I like to go nose out the van waste pipe is on the opposite side of the drain which made use of the full length of the coiled waste pipe.
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