I did learn a few things in this post, namely there isn't a single right answer.
As for my plans, I eventually plan to go the route of multiple inverters, on my next rig:
If possible, I want to go with a Magnum Energy 3000 watt hybrid inverter. For a typical 30 amp motorhome, this will allow me to have the entire 120VAC system completely separate from the outside, getting pure sine wave power, and if there are sags on the shore power side, it won't fry the A/C. When combined with a generator controller and a battery gauge, if the shore power sags for a while, I can configure it to eventually it will automatically fire up the generator so that the batteries don't die.
Of course, a second inverter is always useful. For this, I'm looking at a Morningstar 300 watt PSW inverter. This would come in handy to have an outlet whose job is to charge cordless tool batteries or run a laptop. It also is a good backup just in case something happens to the main inverter.
As above, a larger inverter has larger overhead, so when boondocking and I can turn off the larger inverter, I save those amp-hours. Since I'm looking at a small "C" or a class "B", there isn't much room for batteries (two at most), so every Ah is precious.
