I recently bought two Lifepo4 batteries for my rig's coach power. I'm hopeful they will last longer to power the furnace when boon docking. Question: What's the best way to keep them charged when boon docking? I have a 2k watt power station that has 30 amp input. So do I plug the RV's power cord into the power station for extra power to keep the furnace running longer? Or, as an alternative, could I plug in my Lifepo4 14.6V 20A into the power station then attach it to the coach batteries? Or does anyone else have other ideas?