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If the house has a 30 or 50 amp 240 V outlet somewhere there are adapters to adapt those outlets to 30 amp 120 volt rv female outlets. Look on Home Depot web site.
As long as the power cord is sufficient you can run 30 amp 120V to your rv.
The electric dryer, electric oven or cooktop circuit should be 30 to 50 amp 240 in the house. I often use those outlets to connect a heavy duty 240 v generator power to the house circuits during power outages.
also I have run an instapot on my rv circuits.
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