we had small test day here in Finland.
couple formula offroad buggys where there and some rock crawling/trial car where testing too
https://www.youtube.com/watch?v=lRzuYJIfuL8
https://www.youtube.com/watch?v=BJXMoR3kr_s
https://www.youtube.com/watch?v=8hwLZrt0wVA...
here is cheap and effective way to cut lugs or Groove your tires if you dont have any other tools than drill and old hole saw.
just sharpen the theeth out of your hole saw and let it eat
https://www.youtube.com/watch?v=OL7FYFQ3G0k