Hmmm... good start, but I'd go a bit less bulky, a little bit more sleek and aggressive. I'd also try to play off off some of the VX's existing style elements and do something that complements those.
The thing shouldn't be overbearing for the truck. I'd make the top crossbar thinner, and the same for the ones around the headlights. I think it needs the sidebars to look right, but change the shape a bit. I'd move the skidplate down and have it curl under more and not be quite such a major aesthetic design element. I'd make the vertical risers the centerpiece of the design. They should look like big pointy fangs or tusks and accentuate that by making them match the factory fangs and making everything else on the guard black except for maybe the skidplate at the bottom. No time for Photoshop right now as I'm in a race to dart out the door, but here's a quick workup...
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