I’m confident the cables from the panel are long enough to reach where I’m putting the MPPT.Winner. You don’t even need MC4 connectors if the connections are safely inside the van. You could use an Anderson plug (or similar) instead as long as it is suitably rated. MC4 are surprisingly bulky.
You also won’t need any PV cable and can just use standard 6mm2 inside.
Can I just cut off the MC4 connectors and take the cables straight into the MPPT ?
Mmmm maybe they aren’t.
Got a link to an Anderson plug?