Well, your boyfriend is so lucky to have such a considerate girlfriend like you.
The two most important points of giving him a gift are: he likes it, he is touched and remembers your kindness!
Of course, this actually requires your careful observation. For example, think carefully about what he needs recently, maybe he doesn't use this as a gift. I hope you can find a good gift.
As you said, your boyfriend is a driver, and it is tiring to drive every day. You can give him some car pillows to massage the cervical spine, or a pair of glasses to block ultraviolet rays, because the sun is more dazzling in summer, which will make his eyes more comfortable, etc. Drivers all hope for safety, so giving a peace charm or a decoration to put in the car is very good.
If you can give him what he needs, it will be the most thoughtful, meaningful and best. What is the most thoughtful? It means that based on your usual understanding of him, you think he should need something to make his life better or solve some difficulties. Such a gift is what he needs, and giving it out is also telling the other party that you are paying attention to him and you care about him.