What's not safe about it? The truck drives itself, and on day one Tesla autopilot will have already statistically proven itself as a far safer driver than a human.
I would do this in a heartbeat. Life is too short to believe that we seriously need to spend 5/7 days working for our entire adult life, no matter the type of labor or how much you enjoy it. If you can live comfortably with 20% less income, do it. Money ain't everything.
I don't know how to feel about that subreddit. On one hand, they discuss the daunting reality of climate change in a way you don't see in many other corners of the internet (besides HN). On the other hand, reading it is definitely not good for one's mental health and they often don't propose any solutions, and generally the mood is a very "we lost, the game is over" attitude. That's not going to help anyone, even if we are too late to stop a large amount of warming.