Arizona.

My daughter is in Arizona at the moment. Here are some of the snaps she has taken for me.Firstly a cascade of Cascadias. The Freightliner Cascadia appears to be a popular choice.

The fairings under the trailer, which split the air around the trailer bogie appear to be quite common.
I wonder if we will see them here in the future.

Knight Transportation is based in Phoenix, Arizona.

C.R.England is the US's biggest refrigerated transport company, based in Salt Lake City, Utah.

This Prime Inc Cascadia is some 1000miles (1600kms) from their home base in Springfield, Missouri.

Schneider Transportation trucks are usually all orange, so I'm not sure if this is that same company.

KTS is based in Utah, which is right next to Arizona.

Day cab Cascadia with no trailer fairing is probably not going interstate.
Throwing up spray, as the weather deteriorated.