Ron and Rand are a bit different. Rand's comments on the 1964 CRA were blown out of proportion by self-righteous Lefties. Since then, he's moved further right into Alt-Right territory. Again, not Libertarian.
The only reason why the Pauls ran with the Republicans is because they couldn't get traction, meaning elected, on the LP ticket.
FWIW, the LP isn't perfect and I only agree with them on about 80% of the issues:
https://www.lp.org/platform/ Where the LP and I disagree are on international issues, specifically national security which includes foreign trade and corporate oversight/regulation, including environmental concerns.
This article is a nice summation of Libertarian ideology:
https://thehill.com/homenews/campaign/281399-5-things-the-libertarian-party-stands-for/
5 things the Libertarian Party stands for
Still, the bottom line is that I prefer the LP as Door #3 compared to the Democrats and Republicans. Regardless of how you vote, I encourage all Americans to vote their conscience.