the trails i mentioned are pretty easy i think.
i've mountain biked rollins pass on both sides, the east side is way bumpier and shorter - yankee doodle lake is up there and there is a trailhead to a couple more lakes
i've been up cumberland gulch by st marys in my f250
i took the f250 a couple miles up mammoth gulch, that was easy too
i took my 4runner up to the waldorf mine out of georgetown - that was rocky and fun; i did not get to argentine pass b/c of the weather; lots of mining structures and stuff up there;