Some of us may say that even if you are a heavy user of Carrara, Bryce is still worth having around for this specific usage. Its terrain editor is a lot easier to use, and then you just save out the terrain heightmap and import it into Carrara's terrain generator. If you're trying to make a specific road or riverbed shape, the Bryce option looks even better yet. Try doing that in Carrara, and you end up having the height of everything else you don't want changed messed up. And Bryce also does the fractal terrain tiling thing, but I don't know how that stacks up against the one in Carrara.

Carrara does have the better procedural shader, so you don't really need to go the .obj route with Bryce in this case. Just get the heightmap from the Bryce terrain and then use it under the Carrara terrain editor.

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Barbequed Pixels?

Your friendly neighborhood Wings3D nut.
Also feel free to browse my freebies at ShareCG.
There might be something worth downloading.