Figure out what your loads are. I have the same amount of batteries and a virtually identical solar setup and I have plenty of power. Loaded voltage doesn't tell you the state of charge, of course the voltage is going to be a bit lower when you're pulling from the battery. Don't over discharge your batteries, keep them full of water, and enjoy your free power. I'm not sure what controller you're using, but mine equalizes every 30 days automatically. I have had no issues with my batteries and they're always 100% charged when I go to take the trailer somewhere.