You need to create a morph that moves the track exactly one link forward. Then you create an ESC morph dial that repeats that morph.

Like so: ERC morph dial 0-1 = track morph goes from 0-1. ERC morph dial 1-2 = track morph goes from 0-1. ERC morph dial 2-3 = track morph goes from 0-1.

...and so on.

This creates the illusion of a track continuously moving, as the eyes can't see the track morph "snapping back". (Like with a movie where you won't notice the "stops" between the frames)

Slave this ERC dial to another ERC dial moving your tank forward as well as morphs rotating the boogie wheels and the sprocket, and your tank will actually "run".

Search on ShareCG for Vanishing Points JAGDPANTHER to see an example of this.