Do this at home in the back yard all the time... I have a 20AMP Circuit in my garage that used to be an air compressor station. It is the only thing on the house breaker. I use a long dog bone type adapter to plug my POPUP trailer shore power cord into the 20A Garage circuit..

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I am not a big fan of the various small rubber and plastic adapters you find on the market as they will get hot on me a lot of the time...

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I have two commercial grade 50-foot long YELLOW Contractor extension cords that I picked up from a yard sale a few years ago...
Inside my POPUP trailer I have one of these plug-in AC VOLTMETERS that has a safe zone marked on the meter display... Easy to spot when the AC Level is too low to use the air conditioner...

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I can run everything in my OFF-ROAD POPUP off of the 20Amp Circuit but have to watch what is on at the same time of the higher wattage items... If I draw too much it will pop the garage breaker in the house...
Roy Ken
