It's really too bad that the RCCCv2 will not switch the 5V line instead of the GND line.
My other issue was that I wanted to switch both 5V for the cameras and 12V for the VTX, so the best plan was to switch 2 volt lines with a dual relay. Doing this with the RCCC board was again a bit tricky because it would only switch a ground line that would go floating otherwise, so I had to use a pullup to 5V.
If I had to do this again, while I was not able to find any small RC controlled dual throw relays (the only one I found was huge and 3 times the size and weight), the Pololu 2803 RC Switch with Medium Low-Side MOSFET works for small loads, but if you need relays (and in my case I do because I needed a high side switch, and the mosfet was low side), the next best option is a Pololu 2804 RC Switch with relay. Sadly, the relay on it is big, but I can unsolder it and put a smaller one. I recommend the Pololu switches just because they're very configurable (you can change the setpoint, as well as change the direction they'll turn on/off for).
That said, for more than twice the money, a smaller and less configurable one is the PicoSwitch Radio Controlled Relay.
But anyway, I did have this small dual throw relay already, so I made it work with the RCCCv2 board to switch 5 and 12V.
Relay board testing:
Flipping the lights with my RC contoller
Breadboard testing:
Now trying the whole things with my plane electronics, and checking current draw:
My little dual latching relay board is quite small, it replaces 2 bigger relays:
Initial design:
Better design where the relay is not energized when 5 and 12V power are switched on:
And here is the end result board, showing how it's wired with the RCCCv2 board: