Hi Fil,
Thanks for the comments !
This is a day trip we do every year, it is in the Bugey. Its a kind of large mountain , not very high, covered with forest on the North and some winery on the south part. (headache garanteed type of wine

)
Regarding the wheel, my rim are 16x8 and these are GOSS Modular, if i remember correctly the offset is 30mm. 75euro a piece at Offroad attitude (sorry its in frog

)
I didn't want to have too much offset because 1) it exposes the front disks and 2) it requires more triming to allow to turn.
My set rubs a bit but i don't care
What i can say is this set of wheel/tire is pure fun offroad. The KM2 has fantastic traction and is also much stiffer than the Duratrac which allows to deflate a lot with much less risk to have a flat (tire pinched).
I had so many flat with the Duratrac, but again, the Duratrac are good tires for trails, and distance, but not for mud.