If I run 0 guage fron front batt to rear batt, then connect two amps to rear batt whats the best way....1} run single power wire to distro block fron rear batt 2} run an individual wire from each amp to the batt? Second part whats the best for grounding rear batt? run a ground back to front batt or ground to chassis or both? Also same question on grounding my amps ,to the rear batt or on the frame?

Ground the rear batt to the chassis or make another run of 1/0awg to the front.

You can either use a distro in the back for the power wire to the amps or make a 1-1 run from each amp to the battery. Remember to fuse each 1-1 run though.

Ground your amps to the rear battery.