Were the breakers tripped or turned off? The way to tell the difference is when you try to turn them back on you can't if they were tripped until you first move them to the off position. If you can turn them on without first moving them to the off position they were turned off manually. If would be very strange for all the breakers to trip at the same time.
If there is no power to only one side and the breakers are all on, the problem is likely either one leg of the service at the pedestal is out or your transfer switch on the RV is malfunctioning. You can check it out by using a multimeter to check the power at the pedestal and then check for power at the main breaker.
If it is the transfer switch, there might be a simple trick to restore your power. The transfer switch is basically an electromagnet that pulls a lug (two lugs on a 50 amp RV) to complete the circuit(s). Over the years I have restored power for guests on several occasions by showing them how to tap on the transfer switch with a rubber mallet. (one again proving the answer to "we have a problem" is "get a bigger hammer").