I carry a 30 amp RV extension cord, but have never used it.
I also carry a 12 gauge 15 amp extension with a 30 amp adapter to the trailer cord that I use to keep the trailer plugged into the house circuit during the summer. It keeps the battery charged, runs light-draw items, and I use it for a few minutes to check the A/C, but otherwise only light duty.
I installed a 15 amp receptacle on the outside of the trailer that connects to a dedicated GFI duplex receptacle. I use a short 14 gauge 15 amp cord to supply extra power dedicated to an electric heater or lighter items.
I have also used the 14 gauge cord with an adapter a couple of times when a full campground has allowed me to use a 15 amp tent site.
I carry and use 15>30, 50>30, and 30>15 adapters. The 50>30 is very useful for power posts with iffy or missing 30 amp receptacles.
Except when plugged into my house, I always check a power pedestal before use and use a surge protector while plugged in. The routine is check the power source, if good turn it off, plug in trailer, turn on power. Never plug or unplug the trailer while power is live.
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