[RipNC]

You'll probably need 8 gauge. At the aft end of that slide is an articulated wire mgmt arm that carries at least the 120V wire for the fireplace. Run your wire thru the cabinets and pull the fireplce to exit the bottom of the slide where the arm is - from there you'll need to make decisions on dropping the coroplast or finding another way to run forward. Use an online wire gauge calculator using the amperage draw of your fridge remember your total run length will be almost the twice the camper length (times 2). Most calculators for DC use total wire length of positive and negative wires.