I grew Tromboncino Squash and Butternut Squash up a cattle panel trellis with no problems. I tied off the vines a few times to keep them growing in the direction I wanted but never had to actually support the squash.

Yolos, I just shopped for cattle panels yesterday with plans to use them for squash. I can't tell by the picture how you have the panel stabilized in the ground. Do I need rebar or T-posts?

I use 3/4 inch EMT for the supports. But first I pound rebar into the ground and then slip the EMT over the top of the rebar. But, lots of people just use T posts. This is what the whole thing looked like back in 2012 (without the netting). For the first 4 years, I used nylon netting. But this last year I used 2 approx 4 x 8 foot panels stacked on top of each other and tied to the supports with zip ties. This was my first trellis and I have found since I built this that I do not need the inside legs. Also, you do not really need the top rail but I am OCD and over build everything.

http://www.tractorsupply.com/tsc/search/ok%20panel