With a little bit of persistence, I've managed to find some drawings on the track shoes for the Crawler:
There are 57 track shoes per track, 2 tracks at each of the 4 corners.... I'll save you the grey cells.... 456 track shoes. The original track shoe had just over 550 polygons, that would mean 250000 polygons just for the track shoes alone. I've reduced the polygon count to 352 per shoe and this gives a total of 160512 polygons. Just to put that into some form of perspective: the Orbiter model in F-Sim Space Shuttle is only a humble 8370 polygons.