I found it!

After driving all over Wayne County, burning up a half a tank of gas, and getting mud all over Isabella, I found the only combine in the entire county!

Who knew it was down the street at Walmart the whole time?

So now I am convinced that Wonder Woman loaded up all the combines in her invisible jet, and took them all to Hanger 18.
'Alfonso' and 'Isabella'
Twin 2008 Crown Victoria Police Interceptors
Former Sheriff's Department, Isabella County, Michigan

Inventor of the Blakat Grit Guard, Blakat Funnel, $1 Blakat Trunk Fix, Blakat Jack Mount, Cop Chip, and 'Whackerphobe', and winner of 31 Picture Challenges. nana