I found some articles online about it:
http://www.informaworld.com/smpp/content~db=all~content=a776710764
http://cat.inist.fr/?aModele=afficheN&cpsidt=1190265
http://arc.engin.umich.edu/events/archive/conf/conf98/case2.pdf (a very interesting presentation)...
izax1, I am currently working on some projects with the 810 group. I can tell you that they would direct you to find measured data if at all possible, and that the data will definitely be different between various makes of tracked vehicles, and the sentence you quoted from 810G backs that up...