When you trench a plant in it should always grow a second rootball right at the base, in addition to the original. When you take both of those plus the heavy growth in between, it adds up to quite a bit of nutrient uptake area, all in the warm surface soil. I may have some old pics "documented", have to check.
I think next year I may go back to bigger transplants and trenching them in. It is just a pain through black plastic. For "pre-trenching" I like to use gallon milk jugs. Cut the bottom off and use that square to start the process for a pair of tomatoes, one to the right, one to the left. I just put a marker/divider in to signify which way they are laying.
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