My vote for the GOP ticket would be Trump and Arpaio, two people who are not afraid of a fight!
Arpaio would be wasted in the VP slot. He could be much more effective heading the justice department. He would need to clean house first of course.
If Trump were to win the Presidency, he could appoint Arpaio to some key position like being in charge of the new border fence, or head of ICE. That would be so delicious.