Mystery McLaren tractor-trailer

I have a lot of car thoughts for this weekend. The Chevy Cruze is a very nice car, but it has a few issues. Yesterday, I saw two Phaetons and a Mexican Audi A1.

On the way to the Richmond-San Rafael Bridge yesterday, I saw this McLaren truck in Larkspur. I literally hung up on my wife to snap this picture (I have never hung up on her in the entire 12 years we have known each other). Does anyone know the story behind this?

Update: It belongs to the local McLaren of San Francisco (Palo Alto) dealership.