RE: ONE RECEIVER OR TWO??
The main point of this is there is a lot of misinformation out there about why you MUST run 2 receivers. If you CHOOSE to run 2 receivers that's fine.. that's up to you. I choose to run 1, and accept whatever risks there may be with a single point of failure. I also run dual batteries through dual switches into this one receiver. The reality of electronics is once something passes a burn-in test, it's unlikely it will fail through non-abuse. I see a lot of VERY poor installations these days that could easily contribute to receiver failure. People have gotten away from wrapping receivers in foam and softly mounting them for some reason. I see receivers velcro'd to plywood plates and zip-tied to a thin piece of foam and so forth. Then vibration causes a receiver to break and they blame the receiver.
I think people need to get back to good installation practices.