We had a 20A outlet at our previous house. With a 20>>30 Adapter, it'd run the 13500 A/C we had on that coach, plus the Converter/Charger that handles your 12VDC system and battery.
BUT!!! We kept melting Adapters. If you plan on doing much of this, and it's a "permanent" location, see if you can run a dedicated RV circuit to a proper RV Outlet Box. We did that, and no further problems. At our current house, I ran a dedicated 30A circuit, breaker, wire, box, outlet. It's very nice. But, many say if you do it, go all the way and set up for 50A, with a 30A socket also, like most campground pedestals.
