Grey is abosolutely, 100% correct.
It is a good idea to stake the tomatoes when growing them in a field and don't forget to sucker them (pinch off the new growth beneath the established branches) as this will increase your harvest.
Also, in a field; be mindful of the fact that tomatoes are heavy feeders and that you should not grow them in the same place every year and that crop rotation with legume (preferably several legumes) is a great idea.
Use more than one legume in your rotation (at one time) and mix say peas, vetch and so on with soil builders like buckwheat (you can eat the young greens so, double bonus), (I think Phacelia is actually a N fixer but, you can check that out), Dandelions, perhaps some daikon where you lop the tops off and leave the roots to decompose, and so on.
Also, with this rotation the following season, you will find that the tomatoes will be healthier, grow better and provide more food because with the healthy mix of N-fixers and soil builders, your soil will be healthier and therefore; so will your tomatoe plants.
I'm actually just going to grow Tomatoes and a few other plants in my garden this year so, we can compare notes, if you'd like.