Nice a DT in its natural habitat. Yes you need some AC10's or MT21's for the offroad stuff mate my bike is allot better offroad now I have a crossengo on the back instead that Trailwing.
I sometimes ride upto 20 miles to get to where i'm off roading and 20 miles back and plus nipping out to get rizlas the knobblies will die fast.I will get some better tyres when these are shagged but they were cheap and i like cheap! Getting mucky is great.Just make sure you got a decent jetwasher