Great insights and advice!
Many thanks to all the contributors! The Forum never fails to give me a solid start in educating myself, and I appreciate how much there is to learn when experienced members share their valuable know-how! My gut (with the help of your responses) tells me there's no need to rush out and replace them just yet, so it's time to experiment! Now I think I'll go do some more battery charging, measuring, using, and measuring again to get a better idea of the condition of the batteries.
"I have found through trial and error that I work best under duress. In fact, I work only under duress." -Ed Abbey
Jerry & Susan
2007 19' Bambi SE; 2010 Ford F-150 5.4L SuperCrew 4x4 w/ FlipPac camper shell