I assume you're talking about US 93 through eastern NV? Easy, two lane road. Little traffic and a far distance between towns. As we used to say when I worked in Nevada: Miles and miles of nothing but miles and miles.
Both 318 and US 93 are good ways to head north. There is a free CG at Pahranagat NWR south of Alamo. There are also free campsites in Pioche across from the park on 4th Street. Water and sewer, no electric. They do ask for a donation, but with W & S, it's a deal. There's a pool at the park if you want to cool off.
Cave Lake SP, 7 or 8 miles SE of Ely, is a great place for an overnight. Kind of our go-to place when we're heading west from Collorado. Up in the hills so a little cooler and there are trees (hey, this is NV, trees are a plus!). Showers there also.
Five miles south of Wells in the turnoff to Angel Lake NFS CG. It's a 10 mile paved road to the CG, but great beauty up there. Also at 8400' so quite cool in the evenings. Worth the drive.
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