Big trucks?

So, I don’t know about anyone else, but I always worry and hear about how truck drivers have blind spots and there are constant accidents with them. Like do 18-wheeler style trucks use cameras usually to make up for this? I have a front/back camera from a company called I am a tool. So if they don’t have them, I think they should get one. I think they should be standard on those big trucks. I often wonder if they have some sort of safety net like this or not. Is it just their personal option, or is the company in charge of allowing them or not..