There isn't much wheeling now in the Sierras due to the massive amounts of snow, you'll have to wait until late spring.
You have Fordyce, Rubicon, Signal Peak, Grouse ridge trail, Strawberry pass (to Kirkwood from US 50), Barney Raily, Bear Valley, Corral Hollow, Deer Valley, Eagle Lakes, Genoa Peak, Pardoa's Trail, Round Valley/Mt. Reba, and Slickrock.
No trails huh? Thats just the ones I know about.
Locations and directions here:
http://www.norcalttora.com/trails/index.php
Most of those trails have pretty difficult parts to them, so I'm thinking your just looking for somewhere to goof off as your truck looks fairly stock? Not sure of where to go out in Brentwood. But if you're ever in the Sacto/Folsom area you can try Folsom lake, if the water is down or the Prairie city OHV area.