Yes, ou can use an inverter plugged into the cigarette lighter in the Winegard panel. On shore power this does not drain the battery and it still works off grid. Or you can use the inverter on shore power cord with the converter off and fridge on gas trick so all your receptacles are live--if your converter is not on the receptacle circuit--in which case you can separate them.
You can also run a 120v extension cable with receptacles at one end of it into your storage compartment from an existing receptacle on that wall if any. Remove the receptacle, shove the extension cable through into the compartment, widen the hole as required for the wire and now also the receptacle, bring the wire around to plug into the receptacle, and shove the receptacle back in. You lose the bottom half of the duplex, but still have the top half.
Or you can cut the wires behind that receptacle and "tap in." Or you can go down under and back up as suggested above by others.