Do you really think The Donald would take the Second Spot to anything? Nah..... He’ll be at the top of the Ticket or nothing.
Of course I do. He's no spring chicken (this is likely his last hurrah) , he's probably met most of his personal goals in life, he doesn't like to lose (as a 3rd party he would) and so he'll want something for the cool $100 million he's invested of his own money in the race. And, again, there's the ego. How many people have made VP in their lives?