Without a power cord the status of the breakers does not matter
IF storage provides "Shore power" even if it's just 15 amps then the question is a tad more complex... Assuming a modern RV with a good 3 stage Converter/Charger I'd leave the MAIN and that breaker (CONV) on. rest off.
With an older unit with say a Magnetek 6300 I'd not even plug in but instead pull the batteries to a bench (or disconnect in place) and hook up a battery Minder and plug IT in.
What I do now: Live in RV year round
What I did before I went full time>> Full power but even when it was parked in the back lot for the winter I still used it EVERY day (My Ham Shack don't you know).