Hi Spruce, thanks for the links. Good for trouble shooting when you are first starting. Nothing new for me personally.
On the battery front I realize that it didn't work for you personally but I would really urge people to keep things simple and just run off the van battery if you can.
I sold the old Berlingo and now running a 2007 Dispatch and again just from the van battery. Still no problems whatsoever. Only single pump setup, but worth exploring at the very least. Leisure batteries, split chargers etc, they all add to things that can go wrong in my opinion and adds to the initial outlay.