I have made cages out of concrete wire. They are almost useless as are most tomato cages. I use them in an emergency but am never a happy traveler.
I use rebar eight feet in length and tie the tomato plant with strings overhead. I don't sucker and maintenance is minimal also the fruit does not get crowded.
http://www.durgan.org/URL/?HPJUS 4 May 2014 Overhead Tomato Support Structure
A support structure for 24 tomato plants was constructed from rebar, fence posts and plastic ties. The structure is slightly over 6 feet high. The plants are tied via 1/4 inch soft rope as required.The plants are free to grow unimpeded.
For some plants a simple 4 by 8 concrete mesh is used and the plants string tied to the horizontal support. This works well for cherry type also for normal plants.
http://www.durgan.org/URL/?VARPU 22 May 2014 Three Lemon Boy Tomatoes planted Three Lemon Boy plants were purchased and planted outdoors. This hybrid produces many palm sized tomatoes, bright yellow in color and usually perfect form, with no imperfections. The plants will be allowed to free reign and supported by strings along the trellis, which use to be for luffa plants, which I no longer grow.
Usually I have under 50 plants. For many plants horizontal strings along the plants is probably necessary. I notice the big field commercial growers use strings along both sides of the plants to keep most of the fruit off the ground.