This Ecoflow would be a good trial for LiFeP, and it is very portable. If it works out well I might swap the lead acid battery, upgrade the converter, and add this
https://dakotalithium.com/product/ch...dc-dc-charger/
Which is supposed to limit the amount of current the LiFeP will try to draw from the vehicle alternator.
Those are my thoughts for now.
I haven't been out in a couple of years unfortunately. I need to replace the wood panel by the kitchen side again, plus other work. My Tahoe needs rear wheel bearings, probably fronts too.