My ex-coworker built massive, massive piles of tomatoes. He ended up making his own cages with fencing material: welded wire rectangles just large enough to fit your hand through the holes. He'd make a somewhat over a meter in diameter round thing and stake that to the ground, and once the tomato had grown up to about a meter high, the height of that fence section, he'd stack another on top. I think he ended up pollarding them at a bit over 2 meters because he physically couldn't safely get to tomatoes growing higher than that. Thankfully mine haven't ever grown that tall.