I'll repeat, get a smart multistage power converter/charger. With the setup I have now, mentioned above, the AGMs quickly get charged (in 3 hrs) to 90% at 14.4V in boost mode, then the converter/charger switches to 13.6V to charge the rest of the way to 100%. After that the converter switches to a float charge of 13.2V. There is a monitor LED on the Charge Wizard Pendant that shows the charge mode and I can see it does make it to the float mode indicating the charge is 100%.
Since the AGMs charge to 12.9V, the Battery Monitor that is part of the panel with the other monitors (fresh water, gray, black tank levels) indicated Full for many hours after fully charging while dry camping.
Without the smart charging the converter/charger originally put out a straight 13.6V.
With 13.6V you need to unplug the RV and stop charging the batteries once they are fully charged. With a 13.2V float voltage there is no need to stop charging the batteries.
