would it be better having 2 or 0 gauge power wire running from the battery, to a distribution block, and split into double 4 gauge for two amps? Or could it be 4 gauge all the way?
Always the bigger the better. The bigger the wire the more current that can flow and allows your amps to run easier because its getting the current it needs. So go with 0 gauge to the block then 4 gauge out.