MsF, I'm loving that link about the West Desert. A wealth of information. You should put this in the Susan Powell forum if you already haven't done so.
I am somewhat familiar with the area and the below pic illustrates perfectly why I doubt Josh's story. Then add that it's nighttime, bad snowstorm, frozen snow on the ground, freezing weather, no 4wd, a van and two teeny children. Yeah right!
http://www.summitpost.org/utah-western-desert-ranges/190033#chapter_9
(snip)
Roads, Gas, & Food
Everything is scarce, as befits the desert. Delta, Tooele, Milford and Wendover are the true population centers at its edges. Hwy 6/50 crosses the South part of the desert from Delta to Ely, with a gas station and c-store at the state line.
Three strips of blacktop reach into the desert, from route 6 to IPP and Topaz, from I-80 to Dugway, and from Nevada line to Ibapah. No improved campgrounds in the middle of the area, but there are a few in Tooele area (South Willow, Clover Springs), around Little Sahara, and across from the state line in Great Basin NP.
The Pony Express road is a dirt track that cuts through the heart of the desert and is an area rich in history. Many of the ranges are best accessed by utilizing this historical pathway.
Overall, the "hubs" presented as gateways are the following cities, towns and routes:
Salt Lake City, Wendover, Pony Express, Eureka, Delta, and Milford
Remote dirt road approaches are common in the West Desert
http://www.summitpost.org/another-view-of-the-jeep-track/409219
It's so remote that this website has a disclaimer:
Disclaimer
Many of these ranges are very very isolated and it is your responsibility to be prepared for the event of emergencies or breakdown. Cell service is sketchy or non existant in many areas and you might find your self on a road that becomes impassable for a while due to a storm. If you venture out into these areas, recognize the risk and go accordingly. It is not a bad idea to let others know where you are going and to have another vehicle along. High clearance and often 4WD is a necessity. Be safe and have fun. This part of Utah is a treasure.