I'm sold on replacing the charger with a new IOTA. I like to keep the trailer plugged in over the winter as an emergency shelter, as well as during the summer, - and I never have bothered to remove the batteries. I've been lucky up to the explosion incident and it's just not worth worrying about it anymore. I'll probably wait until the camping season is over up here in Maine since it's beginning to cool down enough that I don't need to keep the A/C running.
2003 GMC 3500 D/A, CC, LB, 4x4 and 2000 Airstream Excella 30. WBCCI 7074