I've thought of this and I am sure that it is done - you drive two sturdy posts at each end of a row. Run very strong cable between the two (anchor it down to the top of the posts well - I suppose you could use a strong chain and nail it in). Every 3 feet or so, or wherever you will be planting the tomatoes in the row, drop down another sturdy cable or chain, reaching down to where the tomato is - secure the growing tomato to the dropped lines.
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Craig
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