"Redneck? More like red ear..." joke

A group of tourists are touring the Wild West and they see a redneck with his ear to the ground.
"
What are you doing?"
they ask curiously.
"
Two cowboys are one a wagon, heading east. There is only one horse pulling the wagon, a black horse with white legs. The cowboys have brown hats on, and one is wearing a red shirt and one is wearing a blue shirt. Their faces and arms are sunburnt, and they have a cracked wheel, rear left."
"
Wow!"
admire the tourists. "
You can tell all that by putting your ear on the ground?"
"
No,"
replied the redneck. "
They just ran over me!"