Hi and welcome. I have two degrees and get asked all the time why I would do "this" as a job. I simply reply, I've wanted to do it for a very long time, love it and wouldn't do anything else. They are usually very surprised.
I've never felt unsafe in my truck. You will see guys pleasuring themselves as you pass. Sometimes they like to proudly show it to you. When they see you pull into the parking lot, you will immediately have neighbors on both sides even if the lot is empty. Makes me laugh. When you've had enough of that, you'll stop looking no matter what they do to get your attention.
Try to stay off the CB. I've had guys follow me into rest areas, etc., just to see who the voice is and yes they will come right up to your truck. My advice is, wear a wedding ring. He leaves without hurt feelings and you haven't made an enemy.
I'm out usually 2-4 weeks only because I choose to be. You will miss showers, plan your stops carefully and carry something for bathroom emergencies, yes they will happen.
If you have any questions, don't hesitate to ask. I have some really hilarious stories and you will too.