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First, you need to understand how a GFCI receptacle works. The GFCI will not reset unless it has power.
The GFCI trips when there is any tiny amount of current difference between the current on the hot (black) wire and the neutral (white) wire.
If there is a short anywhere, the circuit breaker feeding the GFCI will trip. The GFCI does not trip due to an over-current problem but will trip due to the difference in current hot to neutral when a short exists. Don't expect the GFCI to act as a breaker.
Now, your problem is that the GFCI will not reset. That is likely due to no power feeding the GFCI or the GFCI is bad. That would not surprise me. The ones the mfg uses is the cheapest one they can get. The breaker feeding the GFCI might be bad and as others have stated, the campground pedestal might be bad.
It is time to look at the power panel. The RV's power panel is divided in half. There is a 50 amp circuit breaker in the center that accepts power from the campsite power pedestal. The left half of the 50-amp breaker feeds the breakers to the left of it. The right half feeds the breakers to the right of it. To see if you have lost power to one of those halves, find the breaker for the GFCI. Determine which half it is on and see if everything else on that half is working. If it is then the campground pedestal is probably good.
Past this, if you are not experienced using a volt meter, you should seek help.
You should also buy an EMS system. They are expensive but will save you a lot of grief.
I also recommend novice electrical people get a Non-contact voltage pen. If will sense the presence of AC voltage if you get within an inch or two of the circuit. Don't go cheap. Klein is a good buy.
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