My advice would be to use the van for a bit and see what you need rather than rush to swap it out. But if you compare the cabling requirements between the two manuals you should be able to check and most good cabling should have it's sizing in mm2 or AWG on the insulation.
There are also other options, the Ablemail AMT12-2 trickle charger is a popular option and is generally quite easy to wire in near a DC-DC charger.
If you post pictures of your existing setup the forum collective is pretty good with advice and suggestions
Did you manage to sort out what your mystery wire was?
There are also other options, the Ablemail AMT12-2 trickle charger is a popular option and is generally quite easy to wire in near a DC-DC charger.
If you post pictures of your existing setup the forum collective is pretty good with advice and suggestions
Did you manage to sort out what your mystery wire was?