[Brad Townsend]

Life line 8D AGM's are the way to go. Do your homework on prices but at reputable places, there are chinese lookalikes out there. You could contact Life line for distributors in your area
if none then they may send them direct from there factory. Prices can range widely especially if the fake ones are included.
Your meters inside may show any draws on the power but you could also put an amp meter on the positive side of the battery bank, I think. I also have installed a Trimetric battery monitor Model #2020 which monitors everything to do with the batteries. Amp hrs used, Total amp hrs used on life of battery bank, volts, percent full, Amp draw as power is being used, battery high for the day, battery low for the day. This can be an intimidating unit to set up but well worth the time to learn. Many times the voltage reads in the high 14"s which some may think means the batteries are full but when checking the amp hrs there could be a deficit of maybe 40 amp hrs yet to be recovered. This is where folks get in trouble. The high voltage reading does not necessarily mean the batteries are full but that they have to sit at that high voltage for a longer time and without the monitor one can only guess. The monitor requires a 500 amp shunt total package could be $300. I replaced my house and coach batteries within 6 months which give me the option of merging both banks to double my amp hr capacity as long as I know I can recharge both banks when used. I try to exercise both banks hoping to keep them compatible with each other.
Check out the Life Line web site and even call them with questions.

Brad