E-Trek Battery Monitor Install

[photolimo]

I am working on installing a battery monitoring system on our Roadtrek E-Trek. Curious if there is anyone out there with some advice on the subject.

I am planning on installing a Bogart Trimetric on the 24V battery bank to monitor the health of the primary bank. I am a little unsure if there should be a second one on the 12V bank as well. They are electrically connected and have recently been upgraded with a battery balancer.