Can you provide a source for that statement? There are certainly some kind of goods for which your statement is true, but as a general statement I'd say it is just plain wrong.
But almost all products on store shelves got there by truck. As do almost all the products in an Amazon warehouse. And almost all the inputs a factory uses will arrive by truck. Even the gas in the gas station arrives by truck.
Obviously, this doesn't apply to things like video games, netflix subscriptions, gym memberships or electricity. And obviously, trucking costs are lower per-item for items you can fit more of in a truck, and lower as a % of item cost for higher cost items. You'll notice the cost of trucking a lot more on a bag of onions than you will on an nvidia 4090.
If you count a weekly food shop of 50 items as 200 prices per month and a single netflix bill as 1 price per month, "impacts most prices, the most" could be true.
Politicians are generally very wary about things like gas tax increases because they don't just increase the amount households are paying at the gas station, they also increase the cost of the weekly grocery shop and many other things too.