Did the trail clockwise. The northern part of the trail requires high clearance and 4wd and a spotter. A rear locker is very helpful (almost necessary) and a front locker would make some features a lot easier but is not neccessary. The trail get very narrow so wide and long vehicles (full size trucks) may have trouble in sections and will likely suffer body damage. Expect pinstripes from brush on the sides of the trail unless you have a very narrow rig.
The southern section is fine for most trucks/SUVs with decent clearance and either 4wd or really good tires. In late summer to fall the trail is extremely dusty!