So here is what I have been researching for electrical power for my camper. Currently the truck's stock battery and 400w inverter are marginal for my needs. I've narrowed my plan down to my "Ideal System" and my "Value System". I'm going value system for now.
1) Ideal System - Replace my stock Gladiator Starter battery with an 80AH Antigravity LiPO or a Dakota Lithium 135AH LiPO starter battery. Add a pure sign wave inverter and cables/fuse from battery to inverter. Cost $2,000 plus my install labor. With my 240 amp stock alternator included with the Jeep tow package, I only need to run the truck about an hour to recharge the batteries. This is cheaper, lighter, and I think better than an old school dual battery setup and I can always ad a solar panel and mppt controller later. I might do this when my stock battery needs replacement in a couple years. This would end up being a clean install and save weight over stock.
2) Value System - Pecron E600LFP Power station, charged by my 120v 400 watt stock Jeep's inverter. Cost $299. The reason I picked the Pecron was it's price and fast charging rate of 400 watt either from 120v supply or solar. It will take 2.2 hours driving my Jeep to fully charge it. If I recharged it using the 12v cigarette lighter plug (100 watt max) it would take 4 times as long. This should work for keeping my refrigerator running 2-3 days without driving, or less with LED lights, and minimal cooking. The nice thing is that I can add $200 worth of solar collectors to the roof, and be good without driving to recharge. Not enough power for heating the camper, but nice for my minimal needs. Hell I can even run a microwave, coffee maker, or hot plate on this thing.