I went through the same thought process months ago. My older rig had but one 12 FLA deep cycle for house use. My wife is a TV junkie so to make nice I had to build a 2nd platform to allow for a dual battery setup. I decided to keep things simple so I installed an inexpensive 300w inverter and wired it to a standard duplex outlet under the dinette seat with a lighted switch. I purchased 2 Renogy 100ah AGM batteries and ditched the Interstate FLA. Lastly I just finished installing the Renogy 500A Battery monitor to keep tabs on our usage. The upside is that it was relatively inexpensive compared to lithium but has it's limitations. I have to move the tv plug to the inverter outlet for boondocking. An extension cord if the bedroom TV is used. I know it's not ideal but as I mentioned simple and easy to upgrade if 300w is not enough. It's totally isolated from the coach electrical system which I like. So to summarize it all depends on your personal needs and how much you want to spend in labor and or cash.
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John & Evie
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