Maybe I've just been lucky, but the four Optimas I put in my toy hauler in '99 have never seen an AGM "tuned" charger or maintainer.
They've been fed by solar panels (with a controller, of course) when on the road, or a basic BatteryMINDer maintainer when parked. Well, since '13 it's been solar only.
What they do have, and one reason they are still going strong, I think, is that they've always had a Canadus desulfation unit on them.
But yes, I have tweaked a couple of BatteryMINDers to better suit AGM batteries.