The flimsy $1.99 variety that I tried last year, required lots of triage with bamboo, twine and pieces of a trellis - it got pretty ugly. I found IKEA Salvia trellises on clearance last year for $3. So here is the concept of a tomato ladder using pieces of the trellis.
Each ladder uses 6 Salvia trellis squares (there are 9 squares in a pack).
Step 1: Connecting the First Side
Step 2: Adding the Second Side
Step 3: Strengthening the Cage
This helps strengthen the ladder since the top and bottom corners of the trellis are loose.
Step 4: Step 4: Installing in the Garden
There you have it - a thick, steel tomato ladder for $10 each (or $2 in my case because of the clearance deal). Read more about my tomato ladders