What should I ask Juan Villarino?

I’ll be doing a Conversation with him in early May.  He is often known as “the world’s greatest hitchhiker,” here is a NYT profile of him.  Excerpt:

Villarino has cataloged every ride he has ever caught: 2,350, totaling about 100,000 miles in 90 countries, or enough to circumnavigate the globe four times.

He is from Argentina, and worked for a while in a Belfast cheese factory.  He is described as from a “downwardly mobile middle-class family” and:

In Buenos Aires, three men tried to mug him, but when they realized who he was, the thieves gave him money.

And:

They [Villarino and his wife] continue to live on about $7 a day each and travel as they always have, leading a life almost entirely on the highway, without a fixed address or jobs or bills.

Here is his blog and also a link to his self-published book.  Here is his blog in Spanish.  So what should I ask him?