You have to get by the first risk of the idiot electrician giving you 240 instead of 120. Assuming you get by that safely, that is still a long run of wire!
Another approach if you are set-up for off-grid running the microwave and all that, but now are in your back yard with visitors staying in the Rv, is to do the off-grid approach, except now just run miles of extension cord to a stick house 15a to plug in only the RV converter.
The converter is likely rated to run at as low as 105v. So now you can run the rig out there for as long as needed on its inverter to do the microwave , TV, etc, and your batteries are being "supported" by the converter now plugged into the shore power on the long 15a extension cord.
