First Principles:
(1) Donald Trump has nearly unparalleled ego, the satisfaction of which takes precedence over anything else, including GOP preferences. He wants to win, his way.
(2) Donald Trump loves anything that is the biggest and the best: Business success (his claims of "10 Billion Dollars" net worth), High-energy rallies from adoring fans, Tall walls, Strongest military, his own daughter Ivanka's looks.
Based on my observations of the man, I do not believe he would actively attempt to undermine Tesla or Elon Musk. Even if the GOP actively tries to roadblock Tesla at many levels, Trump likely won't go along just to make nice with a party to which he really doesn't belong. I suspect that Mr. Trump likely admires Elon Musk very much, because Elon similarly likes to boast about building the best cars and biggest rockets, and is actually doing it. The two have a lot in common at first glance: outsized ambition, taste for hot women, and multiple divorces. The main difference is that Elon is not cruel in a divisive manner towards certain groups of people.
We in the Tesla camp also have an "inside man": Peter Thiel, whom I read is likely to be Donald Trump's technology advisor. Peter Thiel is on record as saying that Elon is the most impressive member of the "PayPal Mafia" and that he would not bet against Elon on anything. In the event that Trump has to weigh in on a hypothetical matter involving Tesla, having someone like Thiel advising Trump is a good card.
Overall, I expect the Trump administration to have little direct effect on Tesla, because Tesla's products don't need federal incentives to sell.