I would think Trump would want somebody like Cruz, because Cruz obviously is ready to hit hard on his opponents. And whether one is a Trump or Cruz supporter, I think much of the appreciation of those candidates is them attacking those that most Freepers find distasteful.
Of course during this primary season, many of the Trump supporters are hacked off at Cruz. But give Cruz credit for not being a wuss. He obviously will fight and get dirty doing it. Nice to see. That is a rare trait with candidates having a "R" next to their name.
Cruz would have been great as Senate Majority Leader in opposition to the President. He would have shut down Obama's agenda cold unlike the spineless weasels like McConnell, Boehner, and Ryan. And he blocked a lot just with Senator prerogatives.
That said I don't see a role for him in a Trump administration except has the replacement for Scalia on the the Supreme Court.