Roadside camping Sentinel Wilderness

The northern portion of River Rd and a portion of Rt. 86 is bordered by the Sentinel Wilderness near Wilmington. With the W. Ausable in mind, would it be legal primitive camping to park overnight at a pull off on either road and set up a tent well off the road, vs. the not so attractive Wilmington Notch campground?

Owen or Copperas Pond trailheads would seem to be legal to park overnight but perhaps set up camp just down the trail instead of at the ponds.