Found it!
Thank you everyone for your help. I did finally contact Thor and after 20 minutes of searching manuals they were able to give me an answer!!
The house battery on my 2009 MB frame Four Winds Dutchmen Dorado is located on the driver side floor closer to the middle (the transmission tunnel if you will).
It was incredibly misleading as I had previously removed the carpet section and found a gray rubberized/plastic flooring which I took for the vehicle floor.
However, after Thor's input, when simply lifted and removed the plastic flooring exposed the true floor of the vehicle and thus the battery compartment.
Again, thank you all for your camaraderie and assistance!!
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