If yo're going to be actually "camping" at home: install whatever service your rig is already set up for.
If you're just plugging in to run some of the systems, or keep the batteries up to snuff: you can probably get by with a whole lot less.
When I get an external plug set up for mine: it'll most likely just be a 15 amp.
(The rig could be hooked up to a 30...)