I was thinking of using a Y harness from futaba. It basically makes a parallel connection. Using dual BEC's shouln't hurt anything in parallel. Both ESC's will receive the same signal at the same time. I plan to make a special wiring harness that parallels the 2 battery packs to the 2 ESC's so both receive the same voltage and current. If anyone here knows any reason this won't work please let me know.