I made big squares from cattle panels - mine don't fold up - luckily I have room to store them but wish they folded like lyc's
I made a "bending jig" by screwing a big board to a 4x4 post - used that like a vise
used a box end wrench to wrap the tag ends
https://www.dropbox.com/s/krn3hapj1l1h38v/tomato cages.pdf?dl=0
we have raised beds - each bed holds a "six pack" of the squares. When set right next to each other the cages basically become one big unit - impossible to blow over. No staking required. With one plant per box it works out great.
- - - Updated - - -
we set up a fan in the "green house" and make sure the tomatoes are hardened for wind - they develop very thick stalks compared to the wimps grown without a fan.