If anything, he was a libertarian, end-times, Ludite prepper with delusions of superiority.

Just look at that whole segment of "Time Enough For Love" where he homesteads on that new planet. He goes on and on about all the tools he'll need, what he can make, how he defends himself... Very much the prepper fantasy.

Or, have a look at "Farnham's Freehold." Seriously, this is weird stuff. If you want the spoilers, the plot is here: https://en.wikipedia.org/wiki/Farnham%27s_Freehold It's like a manifesto for bored racist misogynistic survivalists. Otherwise, find a copy in a secondhand bookstore and give it a read.

Again, sometimes I wonder what was satire, but he did have a bomb shelter.

The protagonist of Heinlein always winds up being the same character. Him. Idealized him.

Which is okay. Heinlein is one of the most influential authors of Science Fiction. In both positive and negative ways. He was ultimately an optimist, stressed science, distained religion and magical thinking, promoted self-education and a broad skill set. The Sayings of Lazurus Long contain a certain amount of wisdom.