Thank you everyone for the ideas both on connectors and set up. All good. Looks like I was just using wrong terms for my google search! These are exactly what I was looking for! I was just thinking a little too limited, the winch, tow truck jumpers and Aircraft make so much sense.
Special thanks to fpoole - for the photos and extension cord idea!
Traver8 - I agree a 12 vdc CPAP option would likely be cheaper...but I am always amazed at the extra stuff we (especially when grand children are with us) end up plugging in for the 110 vac. AND I just kind of like the redundancy of the extra battery capacity. It has proven helpful on more than one occasion.
Any other ideas on "Threads" here for installation ideas would be very welcome. As I mentioned in original post, I know i have seen some here, but have been stumped on "Search Words" to find.
