if it's a 50amp 240v RV, then it sounds like you've lost one LEG of your incoming power, which has TWO Hot Legs to serve two 'sides' of your Breaker Panel. Generally, you'll have one a/c unit and outlets on one 'side', and the other a/c unit and other outlets on the other 'side' of power.
Either the Shore Power breaker has a loose hot wire on one side, or your own breaker panel's 50amp double-pole outlet has a loose wire, OR it could even be your ATS(Auto Transfer Switch) if you have one(for RVs with a generator).
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