Star Trails with a Dead Tree in a Corn Field

I've been wanting to shoot this dead tree since I moved in. It's about 100 feet off the side of a 5 lane highway. Now that the corn is tall enough, the tree sits in sort of a horseshoe-shaped clearing that blocks most of the headlights from traffic, and also lets me hide from passing cars.

The tree sits far enough back that I felt comfortable leaving both my cameras out there for about an hour and a half. Unfortunately clouds rolled in after about an hour. This scene is definitely the next step in my star trail development because it has actual subject matter! I'll definitely be back for more.