Status monitor for battery bank

[N1VWD]

I have two size 27 deep cycle batteries wired in parallel for my TT. My TT has the basic combo tank and battery column of lights level monitor. I would really prefer a number read out and not an idiot light set up like I have now. I wish to monitor my batteries and prevent them from being discharged bellow 50% to maximize their usable life. Who makes a decent monitor that can be wall mounted in my TT. What do you recommend??
Thank you all in advance for your replies.

[gcampbell]

I use a TriMetric Battery system by Bogart Engineering. It the model made for RV's, TM-2025 RV. Bogart Engineering | manufacturer of the TriMetric battery monitor which measures volts, amps and amp-hours for battery systems
I found it accurate and it will do just about anything you want it to.