Common causes of "Some outlets dead"
GFCI: if the dead outlets are kitchen, bath and patio, it's most likely the GFCI, look in the first two of those listed.. If they are in other places it may still be a GFCI, but harder to find.
INVERTER: If your RV has an inverter in the Thousand(s) of watt range, it may have one or two circuit breakers on it. Often PUSH TO RESET type and often hard to find as they tend to put 'em on the backside for some idiotic reason.
Which reminds me of work I need to do.
Circuit breaker.. Of course you checked those but if you have an inverter there may be more hidden.
Bad connection: I could tell you what i think of the el-cheapo outlets and the STAB type connectors where you poke a wire into a hole to hook it up but if I did the moderators would have to moderate so I'll save them the work.
Bad connnection 2: Wires (Behind GFCI) came appart
Bad connection 3: Screw loose... Many RVers have a few screws loose, one of the circuit breakers in my power panel took over 2 full turns before it even started to offer resistance to my driver.. IT's tight now.
Home is where I park it!