Put views aside. Trump running as the Constitution or Libertarian Party candidate as opposed to Indy would be in HIGH demand because if he can finish with 25% of the popular vote, by law, the FEC would reclassify that party as a major party for 2020, which means they can accept $100 million in public financing for the general and $50 million for the primaries for an actual Constitutionalist/Libertarian nominee. Even if he only gets 5-25%, they would still get access to a proportion of that fund.
If you look at it for the Libertarians especially, it could mean Rand Paul could forgo the Republican nomination process and go fully "liberty movement" in his politics next time. Supporting Trump now would be YUGE for them.
The Libertarians will fall on their own sword and spite Trump, but the Constitution Party would gladly take him.