Can't help you with lithium and I just stick with lead acid so far. If weight is a big issue lith is probably the way to go. Running a resi is no big deal.
I'm interested and following along so post pics or whatever you can.
Like I said the residential is not a big deal here's what I'm running.
Six GC 2, 2000 watt xantrex prowatt, 1000 watts of panels, whirlpool 10.7 resi, satellite, 40 inch LED, 19 inch LED, LED bulbs and the rest of the normal RV stuff. I don't invert to the microwave but do for the toaster at times and a hairdryer.