Olive600, as another Ahem 'mature' woman owning an RV I feel your pain. Luckily my brother is an electrician and my neighbor a mechanical engineer so I have a wealth of knowledge at my fingertips.
My house was built in '03. I have outside plugs that are dedicated for ONLY the outside/porch plugs. They are also on 20A breakers (be friends with your breaker box!). I can plug my RV, which is a 30A RV, into the outside outlet with a SHORT high-rated extension cord and run the AC. I do NOT run anything else when I've got the AC on in the RV, except maybe a light. I have never tripped the breaker or had a problem.
The key here being my house is fairly new, the outdoor plugs have nothing else plugged into them, and the extension cord is THICK and SHORT (i.e. more wire for the current to flow through).
