When Skip and I built our cattle panel run for our Playhouse coop, we doubled 16' cattle panels and used pressure treated 2 x 4's for our center supports in the run.
We added fence posts to the 2 x 4 uprights to hold them in place an it has worked well for us, so far. We've had several wet snows since we built this in the late summer/early fall of 2007 and the run is standing strong.
Hope this is some help!
Dawn

We added fence posts to the 2 x 4 uprights to hold them in place an it has worked well for us, so far. We've had several wet snows since we built this in the late summer/early fall of 2007 and the run is standing strong.
Hope this is some help!
Dawn