Two nurseries send identical plants to the same buyer in the Netherlands. One fills a full trailer; the other has enough for half. The full load moves at a rate per trolley that looks almost trivial. The half load carries the same trailer cost spread over half the trolleys — so every plant on it is burdened with the freight of a ghost plant that isn't there.
That is the quiet penalty a small grower pays on every under-filled run. It doesn't show up as a line on an invoice. It shows up as a thinner margin on exactly the export orders that were meant to grow the business: the long lanes, where freight is the biggest single cost after the plant itself.
The trade worked out the answer generations ago, long before anyone had software for it. You don't send half a truck. You send half a truck of yours and half a truck of someone else's, and you split the lane between you. Groupage, consolidating part-loads into one full vehicle, is how a small nursery buys freight at a big nursery's price. The idea is old. What is new is that it only pays off if the paperwork behind it is exact.