....old saying....if you want a hole in the roof-just drill it and it will leak....drop a plastic conduit down the side/back/front of the rig and enter/exit cables through that....use a drip loop at each end.....or run it in a conduit bent 90 degrees back ways and add a tube of silicone as a final plug....with any luck the rain will be blowing the other way at a parking area and if it is bent backwards it won't leak when moving down the highway if your internal pressure is the same as the outside of the truck-with a air to air heat exchanger it will balance itself when moving.....geofkaye
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