"There are some who will say that any backcountry travel in Death Valley using a normal street vehicle in Summer is inherently foolish. This is certainly a debatable topic."
No, it's not.
No, it's not.
Any time of year, parts of DV back country are not to be taken lightly. You may not see anyone for days if something goes wrong.
Still, it can be really hard to turn around when you're far enough in to be "committed" to the road. Sunk costs and all that.
Here, if you find this stuff interesting: http://confluence.org/confluence.php?id=223
EDIT: And summer certainly raises the stakes.