I did some more looking into the single battery setup...Looks like guys use capacitors and diodes to keep pulses from coming back through to the Rx..Do you use anything for this?
That was part of the reasoning from the guys at the field against the single pack setup. They thought the ignition would introduce too much interference in the RX.
Also, I located a small thin strip of stainless steel for my battery tabs. The guy at batteries plus said they just use stainless connectors, so that should work well.