Where are you located in DFW? Toro, Torn, TCCRA are hare scrambles. For enduro look at the TSCEC. For trail riding look to Red River Motorcycle trails, Barnwell Mountian Recration. There are more places, but those are certainly the largest.
The XR600 is a pretty mighty beast for the terrain out here, but is plenty capable as long as you can hold up!
I live out near Forney (south east of the Metroplex).
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2013 KTM300XC