I know it's late....
but since it's a 2D front view, i would try and make a solid layer, put a VEGAS effect on top of it, draw a mask around the tanks track, then probabely do the whole animation of the tank
wheels and track (its a mask so you can animate separate vertex points). And when the whole animation is set and done i would precompose the track solid layer and move the
mask and effects to the PRECOMPOSED layer. Now back in the original layer i would put some effects (bevel emboss?) on the precomposed track.
I think you could skip the vegas and mask effect and do the shape layer with segemented stroke animation.
But VEGAS does give nice effect in this case.
yeah i know it's late
artur