Pretty simple. For voltage drop of less than .5 volts, a single one foot run of 0 gauge can handle nearly 5000 amps.
http://bcae1.com/images/swfs/wirepowercalculator.swf
If you have this near the battery bank, which you need to support the amp, then you will have a short run.
Singe 1/0 input/output is fine.
People throw fits about these, but it's not a big deal. You can pull plenty of current for daily through these. If you have to do 15' runs, then you bring in several and reduce it, as others have done.