WVC is in the populated SLC metro, you don't have to go too far, however, to get desolate.
Check Google Maps for "Simpson Springs, UT" (the campground on the Pony Express Trail). There is desolation.
12:30am Monday morning is pretty quiet on the roads, and
that style mini-van is pretty common, its not really going to register in anyone's memory. The fueling range is pretty long, so there are way too many gas stations in that radius to ever look at all the security cameras.
There are a lot of cameras on freeways, may be worth checking those to see the car go by according to his stated timeline...not sure how well they see individual vehicles at night.
http://www.utahcommuterlink.com/