Last year I tried tomatoes on one of my arches - just one on each side, wove them in and out of the wires as they grew, so almost no tying. I can't seem to find a photo with ripe tomatoes, but it worked well, these were two of my most prolific plants, a Kosovo and a Belmonte. Often I pinch my tomatoes back if they go over 6-7ft, these I just let go.
