I rewired my '71 Starcraft, both 120 VAC and 12V DC. I used a 75 amp load center I found on sale at Home Depot for the 120V and my old PD converter had fused break-outs for 12V. Since I now have solar charging and am always inverting 12V, I have a pretty sophisticated distribution panel with connections to two battery banks. The distro panel has (3) master disconnect switches to separate service to 12V devices and choice of battery bank. I used stranded 14 awg for all 12V power. All my lights are LED and there are a few power ports around the bunks, furnace, etc. I did run a discrete 12V (-) phase wire to all 12V devices. 12V troubleshooting can be difficult enough without worrying about loss of ground continuity. The separate (-) phase wire eliminates that.
Good luck on your electrical work!
