You will save a good bit of weight going from 4 x 6V batteries to a pair of 100 Ah LiFePO4 batteries. Depending upon the brand you choose, you might consider running a single 200 Ah battery instead for the same or lesser price. While your current converter will only charge the LiFePO4 to about 80%, a MPPT controller for solar charging should be able to top off the batteries so long as you have good sun available and you are not pulling more out of the batteries than your solar can overcome. Be sure to get the entire mfg specs on your LiFePO4 due to needing to set up each parameter correctly in your MPPT controller. Good luck and have fun with your upgrade! 
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 Lee, Edith, Lil' Bit & Cuddles
22 MHC 331RL, Surge Guard 35550, SumoSprings, Kodiak disc brakes, 412Ah Lithium, Gen 3 Goosebox, Sailun 85s
22 Ram 3500 CC DRW 6.7 CTD Herrin Hauler Classic Bed, 45 gal AUX tank
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