Looks like Tonopah, Nevada for at least two of them:

The garage photo: https://goo.gl/maps/kDAs2buEaaL2

The car sticking out of the earth:

https://goo.gl/maps/JuFdKETPtgw

http://www.atlasobscura.com/places/international-car-forest-...

Two more appear to be in Red Oak, Iowa. I googled for "red oak printing" that is visible in one of the photos, which led to coolbaugh lane on the map, which is also visible in another photo.

https://goo.gl/maps/b8vnAwEndWz

Thanks for the sleuthing! A map of his 7000 mile trip[1] would definitely have been interesting, at least to me.

[1] http://danielfreemanphotography.co.uk/introduction-usa-serie...