Looks interesting, but I'm not sure about tomato. At least not for me, I'm short and would need a ladder. I've had tomato plants get well over 6 ft tall, probably over 8'. But they vined up a shrub that was behind them. 4 ft with some of the cages I use is nothing. Probably work well with the "patio" type though.Looking at those counter height raised beds makes me want to build one for some tomato plants.
We use something similar to these on our deck. They don't wave the lower water chamber and they're made to go on our railing.You might look into these "Grow Boxes " . Here are a couple of pics of ours where we used to live .
You can plant pretty much whatever you want in them . All you have to do is keep a lower chamber filled with water ( no watering from above ) I still put in wire cages with tomatoes and peppers . You can still move them around if needed and can put away at the end of the season .
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