Tank track imprints

Hello! I’m working on a project and I’m wondering what would be the best way to implement the imprint of tank tracks in mud/dirt as seen in the below images.

http://gallery.usgs.gov/images/12_15_2008/h41Ogs6FEa/medium/cwills26.JPG

Would it be better to some how texture it in, or model/sculpt it? Your advice and time is appreciated. Thanks!

You could try to use some alpha brush and sculpt, but it’s possible to use your tracks to leave track using Dynamic Paint. As a result there is ready to go normalmap.
Here is example and blend. Depending on final results you are after you might try to combine this texture, map to certain polys of your ground or add some with sculpt.
http://www.pasteall.org/pic/show.php?id=52802
http://www.pasteall.org/blend/21872