If he gets the nomination and wins I can’t see Trump serving a full term. I think he will soon become disenchanted and resign when finds out the job is like living an not so gilded cage in his case. Can’t see him liking the SS controlling his movements and having to put his business interests in a blind trust
So who ever he picks as VP is very likely to need to step in and I can’t see him handing the job to Cruz or any Conservative for that matter.
I cannot see Trump resigning for any reason. If you accept the idea that he is successful because he is not a quitter, and that he is actually quite a smart guy who considers his moves very carefully, then this is obvious. If, however, you simply view him as being a guy with a big ego, then quitting would be a huge blow to his ego, his standing in his family, and his place in history. Whether he would run for a second term or not is another matter, but there is simply no way that Donald Trump will ever quit a high-profile job like this. That is simply not in his character. I think that you have completely misread the man.