I suppose I won't be certain that the problem is gone for sure until I have the new converter. I will work towards the two matching deep cycle batteries. I bought a charger last year that has a desulfate mode and turned around several batteries that others had given up on. Have had quite good luck with them unless they are ran slap dead again (remember the inlaws). Batteries that were going to be turned in for core are in my truck, my son's truck and a Carolina Skif almost a year now with no issues.
I have a couple of 100 watt and one 750 watt inverter that I can use in the camper when need be so I don't think I need the inverter/charger but was there any specific one that you had in mind?
I will advise when the new 9200 60A converter is installed as to if problem was solved or not. Thanks for all the help!!