If trucking prices go up, companies might opt to move more cargo at the same time (same amount of moved cargo, but less trucks on the road) or they might simply eat the loss (if they're already making massive profits) or any number of alternatives.
If we were to take your argument into absurdity, the best thing to do would be to reduce trucking prices to $0, because then we would fundamentally move a lot more cargo, which would drive down prices across all of the US benefiting a lot more than just the small minority of truckers.
It's an overly simplistic way of looking at things that reminds me of the assumption that raising the minimum wage would cause the prices on everything to hike up by the same amount.