Wrong place, but need quick electrical assist

[Outbackmel]

Outback Mel is out here in AZ and plugged into RV park 50amp. All has been well UNTIL this evening when power went down. Tripped all switches and re booted 50 amp. After 3 minutes, went dead again.

Used "step down" plug on power cord to RV park power box taking available amps down to 30. Have limited power for the past hour. We need it for the furnace fan tonight, cold nights here. The High Point microwave (which we do not need to use tonight) does not even light up?? Looking for a "reset" of some sort. Manual is zero help.

Park will check 50 amp service tomorrow, so until we can figure out the issue, we are in conservative use mode.

I am thinking it is within our rv, not their box so I am trying to be proactive. Is there like a fuse someplace other than those in the breaker panel box that may have blown and is restricting electrical flow into the RV? I have no clue.

All advice appreciated....