I notice that you live in Surprise. I also live in the north valley, so I can give you a few north valley suggestions.
My dogs and I love Table Mesa Road (I-17 exit 236). There is a ton of trails back there (on the WEST side of I-17), and you can either stay on the main road, or take trails that range from easy all the way to hard core rock buggy stuff.
Another good set of trails (although more congested) is The Boulders OHV area which is on Carefree Highway (SR74) at mile marker 11.5. This area has a lot of trails that are used by quads and dirt bikes, but trucks/SUVs are out there too.