I've been a few times and I'm going again in October. I'm taking my YZ, but there is plenty to do on a bike bike.
I suggest the area around Ashland Resort. That area has the "outlaw" trails and 2 Hatmac systems.
There is plenty of active mining with interstate width haul roads, logging roads, backwoods twisties with no center lines, etc.
Can you ride a S10 on the trails? I could, and I'd like to, but I would not do it alone and I would not do it in wet conditions. The green trails are the ones that get used the most and can be pretty torn up. However, there are miles and miles of green trails that are very well groomed gravel roads for gas or mining operations.
In general, it is rocky. Some areas are solid rock. i can't think of any green or blue trails that wouldn't be doable in dry conditions, but you better be good and the consequences could be very high.
All that said, if I were going there with only my big bike, I would explore the area and stay off the hatmac trail system. Save the $50 for beer.
Seasoned veterans of the area will say that the outlaw trails are just as good or better. i agree in some respects, but they are totally unmarked and without a guide, you will be lost all day. The outlaw trails on a S10 is a bad idea unless you have plenty of help, imo.
Rockhouse is fun. i think I've ridden every mile of it.
I have some videos and pics. I'll try and post some up.
Shelley is a Slut
Rockhouse Trail 130 Oct 2010
