Nope. Have never even heard of a full-length rack, and you can't put the longer one from a suburban or Yukon XL on, the mounts don't line up the same.
About all you can do is have a frame made that would tie in to the existing rack, and have it extend out toward the front. Then you could make whatever mounts you needed, for the tire, bikes, kayaks, skis, etc...
I'm not saying you couldn't piece together a couple of the factory roof racks, and drill new holes in your roof for mounts, but the roofline slopes towards the windshield, your modified roof rack would have to slope with it.
Me, I just added four extra crossbars to mine:
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