Do they know how much weight is in the truck and does it matter?

My route is on average 8000 lbs. Deliver to Amazon/ national Park that is heavily trafficked/ temu/ massive construction companies. I'm wondering if that matters as I'm much slower with triple to quadruple the weight. I go at a safe manor so I don't care but I am very curious on that answer. Do they see 200 stops or do they see 200 stops with x amount of weight. I assume it's just a stop count.