It is highly unlikely that either would accept the role of VP for the other, and it is also highly unlikely that either would offer the spot on the ticket to the other.
The more pertinent question is: “what will happen when one or the other of the two wins the nomination?” Will the Trumpeters decide to accept a Cruz nomination and support him in the general if Cruz wins? Will the Cruzers decide to support Trump in the general if Trump wins? From what I’ve seen here on FR, I doubt that most of either camp will get on board with the other; across the country in the general population, who knows?
We should all sign a pledge we will support the front runner! :)
Actually, I will, either way.