Would you say something to your neighbors?

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Long so bear with me. We just bought our home in Feb so we are still relatively new to the neighborhood. We live in a culdesac. Our neighbors to the right of us do not have any "street parking" room at there house. They have a car that stays in the garage, and a huge truck and even bigger work truck that stays in the driveway. Well, that's where it should be anyway. He is constantly parking his huge work truck in front of our home on the LEFT side, so not even next to his house. It blocks our mailbox and forces the mail lady to physically get out to put our mail in. I dont know if he did this before we moved but I'm worried shes going to get mad and not deliver our mail. I get he needs to play "musical cars" in his driveway, but that would put him parking there 5 minutes max.

He parked there last night at 6pm and it is almost noon the next day and the truck is still there. I watched him and his wife both leave this morning (him in his personal truck) and they left the work truck in front of my house with their driveway empty. Its pouring so the mail lady will either get soaked or skip us. Not only is it the whole mail thing, but what if I need someone to park there? And who wants to look out their window or sit on their porch and stare at a huge red truck? I also have to back out differently which is just annoying. Ok, now I'm just getting nitpicky but still

Would you say something? If so, Would you write a nice note or knock on their door? I dont want them to hate me but it's a regular occurrence and yesterday and today just really pissed me off