The only time I have wheeled in the Bend area is when we went 2 years ago. It was pretty much a dust eating weekend and we never really found much other than great views.
You may want to check out this place though
http://www.fs.fed.us/r6/centraloregon/recreation/cohvops/nmvindex.shtml

The area is divided up into 3 areas.. North, South and the Plateau. We messed around a bit in the Plateau area and ended up in a quad area so it burned up too much time. On the way out, we ended up seeing where we needed to be but haven't been back since. I am pretty sure the North area is where the wheeling is.