On a road trip, someone who starts in the back works their way up to the front seat by complaining about their current position. They can also take the seat when your not in it, or take it by force. Choose someone with a low bullshit tolerance to drive, so that the Sneak doesn't succeed.
Did you hear Jamie? She whined the whole car ride to Missouri.
Yeah, she could have just asked to switch spots, it's too bad she was such a seat sneak about it.
God I hate her. It's a good thing I brought my pocket knife.