Sal,
You may be correct regarding flooded batteries. All flooded batteries I've ever owned down through the years have NEVER showed zero current flow whether on high voltage/current chargers for a day, or when on good old trickle chargers for days. The liquid electrolyte in them just seems to continue to conduct some current "forever" ... as indicated by the amperage meters on the chargers. I'm not talking about when flooded batteries "bubble" due to too much voltage left on them too long. I'm referring to situations where the batteries are silent (no bubbling) ... but the amperage meters on the chargers still show current flow after long time periods of charging.
However, this has not been how our two different brand names of RV AGM batteries have acted. Per the ammeter, eventually they hit a "hard stop" on current flow .... regardless of whether they're on the 13.6 volt converter or the 14.X volt engine alternator and regardless of ambient temperature. I really like this characteristic about them - when the ammeter I've built into the system finally shows zero current flow they're full. No ambiguity regarding whether or not they're full.
I'm not sure that many AGM RV battery owners realize that they act this way when full. To me, it's a great AGM battery "feature" that helps with good battery management ... that is IF one uses an ammeter with their RV battery systems ... which many folks do not.