I want to thank each of you for your help on this - the responses have been wonderful and I learned a great deal. One lesson in life that came to me early on - and I sometimes tend to let it go by (but not so much) - is that no one (even me!) knows everything and there is no "shame on you" for asking.
OK.
We are back into a town area and checking around find out there is a place that rents equipment of all kinds - up to heavy construction size - who handles batteries. Call him and he does some checking and comes up with the right ones and they are name brand and he has them in stock! And he is about a mile down the road! And he has a fair price.
Go get two and put them in. Immediately our 12v lights that we dim are bright again! So, OK I think, will leave the water heater on electric overnight and see what happens. HOT WATER on electric.
Ironically, I have two different RV friends at home who told me early on to scrap the 70 day great trip and come home. But with the workarounds and good, solid advice here, I was able to keep going until I could find batteries to at least try that.
Again, thank you so much for your advice and support.
Lauren