I attached an aluminum to tongue box on mine. Cut out a bunch of vents and bolted it to the frame with a few beads of silicone between the frame and the box.
I am pleased so far with the results. I however have since swapped out the
battery for an Optima D31M deep cell sealed
battery that vents outside the box.
All
propane lines are plumbed outside the box except connector.
Happy with it so far, used it one trip and a thousand miles. Still a work in progress.