There are some battle tanks with catapillar treads in the MP - but it would cost to see how

Or you could download the free one:

http://www.ontarget3d.com/Products/185-m1-abrams-for-poser.aspx

But that solution is not ideal for a conveyer belt. The tank track programming works for tracks, and things like an escalator, belt fed machine gun, etc, where the links are seperate pieces of geometry. For a conveyer belt the method above of animating the texture is the best solution.

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