Hi
Stu 
Welcome to
and to the board.
...I have no idea.
Maybe it's just a vehicle they have easy access too.
I know when Guy Bee directs there will usually be an old muscle car floating in the background somewhere, but the jeep?
You could try asking Jim Michaels on twitter?
Since this topic doesn't warrent it's own discussion thread, I'm going to go ahead and move it to the SPN general discussion thread.
I will leave a redirect up for a couple of hours so you can find the new thread.