I wouldn't install a Marine/RV battery in our RV to power the coach. IMHO, a deep cycle only (not Marine or Starting) battery should be used.
I don't know that Die Hard offers a true deep cycle only battery - in either AGM or wet cell design? Interstate used to offer a true deep cycle only 12 volt battery - but it was AGM. That's why I had two of these Interstate batteries in our RV for over 8 years. I believe that Interstate still does offer some large 12 volt true deep cycle AGM batteries. At the bottom of this chart are a couple of large 12 volt true deep cycle AGM batteries very similar to what I had in our RV:
http://www.interstatebatteries.com/content/product_info/wheelchair_spec.asp It's very difficult to find true deep cycle 12 volt batteries that are wet cell - most all are AGM - which means expensive. That's why most folks use 6 volt golf cart batteries in their RVs. These are wet cell batteries, are true deep cycle, our easy to find, and are not expensive.