Have a 50A RV and when Brand New we lived in it alongside our empty house waiting for escrow to close.
Lived in it for 2 months. Course it was Feb/Mar so no A/C needed
Fridge/water heater on propane
Converter maintained batteries
We had lights at night....watched TV/DVDs
No Microwave
Managed just fine
As suggested get 30A/50aand 20-15A/30A 'dogbone' style (NO 'Pucks'---they are junk)
30A Male end/50A Female end
15A Male end /30A Female end
OR just a 15A Male to 50A Female adapter
We have BOTH and used 30A/50A at many CGs
Only used the 15A/30A when next to house and one other time at a friends place