Romney would be the best VP for Trump
To follow up from some comments:
The best possible VP pick for Trump would be Romney. Romney would help bridge the gap between Trump and the establishment. There’s not a single establishment Republican better liked and respected than Romney. That’s why people are even talking about Romney being picked as the nominee if there’s a brokered convention.
Remember the VP’s only job is to attend funerals. He has no constitutional authority to set policy. Based on these criteria, Romney would obviously be best at the job because he looks really good in a dark suit, he’d look very vice-presidential at funerals.
The problem is that I don’t think Romney wants the job. A second problem is that Romney has said some negative things about Trump, but Trump, who is the master of making deals (he wrote the book), would surely be willing to make peace in order to increase his chance of winning the election. But once again, I don’t think that Romney wants the job.