Hi, new to this and could use some help.  I'm upgrading the battery system to Lifepo batteries and was wondering if anyone has attempted that?  I don't have any info on the wiring of this rig and previous owners had combined the chassis and house batteries.  The previous owner was nice enough to deliver it to us from New Jersey to Connecticut and stated I probably should connect a charger to it, which I failed to do and a week later they didn't have enough juice to start it.  Thanks for reading and hope someone can help me figure it all out.

Thanks Chris