Ralph, of course you should probably be using only true deep cycle batteries in your TC. AGM would be best for camping.
We now use a couple of Fullriver 12V Group 31 deep cycle AGM batteries in our small 14 year old Class C. However, the first set of two deep cycle AGM batteries that we used in our Class C lasted around 8 years, were branded as Interstate, and were this 12V Group 29 100 amp hour AGM model:
https://products.interstatebatteries.com/#/product/detail/DCM0100LP.S. Ralph - My goal in trying to help you out here was to keep you traveling in comfort so that I could continue to get Garmin database updates of your outstanding TC travels and camping spots. :)