Voltage Regulator Question

IMO, 4G is decent in the engine compartment but not adequate for a long run to the trunk. I have always used 0 or 00 welding cable. Also, the ground back through the chassis needs to be done with large gage cables, good quality crimped or screw clamped lugs at all connections, bare clean metal, and some sort No-Ox or similar conductive paste. Ground 'noise' and ground transients can realy mess things up. I would just make sure this is all good.