I don't think this area is knob hill but we found a great spot out Wee Thump Rd about 1.5 miles of the highway near where the pin is on the map. Road was decent for our 2 wheel drive 31" motorhome. It was nice to have some shade from the Joshua trees. We took the third dispersed site. All 3 that we saw were quite large. Great for any size vehicle. Verizon service was great. Nice secluded area.