You can install a "cable hatch" in the cargo space access doors on each side of the pass-through. They have the little snap in opening for the cable you can leave open which is also in the bigger hatch opening that can be left open.
That lets you lock the access doors as usual, but provides ventilation.
It also provides access for wires if you have a portable solar set to get at the batteries. In this case you will have drilled through from under the bed to the cargo space for the wires from battery to inverter, so you can run your solar wires through the same hole, and keep the controller in with the inverter. Actually you would just run the controller's output wires over to the inverter's input terminals.
You can have a deck mount converter in there too with the inverter and controller if you can run 120v to it from under the bed with an extension cord.