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Oh no, I really shouldn't be here LOL.
Bellypan was something I've been considering for my truck but never got around to it.
Looking at your utility box, a few things jump out at me.
1; the steel frame on is exposed on the outside of the plywood sheeting. This creates a lot of extra surface area and air drag on the sides of the box. I noticed that a lot when hauling railings on my truck. Its quite noticeable how much it slowed the truck down even with a single length on top. (which is one of many reasons I tow a trailer these days instead).
2; The cover you have on there. What you could try is removing the rear wall and storing it at home when not needed, then slant the cover down to the bed to simulate the "boat tail" effect. Better yet, the rear gate could still be hauled inside in a folded down position perhaps...
3; rear skirts. I've started to notice big rigs using these lately. (it seems I can't post images or links yet but just google big rig aerodynamics skirt on an image search and you'll see the filler panels they hang on either side of the longer trailers)
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