Interestingly, I left the convention less fearful of a Trump presidency than I did going in. There were two major factors in that. First was Paul Ryan's speech, which laid out a far more traditional Pub approach to governance, and left me feeling that Congress would be calling the policy shots, not the White House. The second was the acceptance speech, where Trump clearly started paying attention to his campaign staff. He avoided any name calling and very closely followed the script given to him. He even went so far as to quell the "Lock her up" chant, which was certainly instilled by Manafort, et al. That doesn't suggest to me that he isn't going to launch on opponents as he thinks fits the tenor of a speech, but it does suggest that his staff now actually has influence in Trump's decisions.
These are comforting thoughts. However, there is something even more important that should motivate Pubs to vote Trump.
Pubs have not been able to pass a single piece of Pub friendly legislation due to obstruction by the Dems in the Senate and in the White House. The only way for Pubs to actually legislate is for them to put a Pub president in the White House. And Trump is the best such president, because he is only interested in the direction the country is heading in and not policy details, which will be left to Ryan and McConnell.
This is very much neglected (to their cost) by Democrats. I think the idea that Trump would be a puppet to the GoP elite and plans on governing that way would be far more destructive to him than anything else.