We used some Churro for our collector on this years bot with no issues...
You can't really see it in that picture because the PVC spacers cover it, but it extends across the entire length of the collector, drives the wheels, and is only supported on the ends. Overall we've been very happy with it, especially because it's light and rigid (and because we already had some around when VEXPro ran out of their long hex stock during build season).
Now granted this application probably undergoes far less force than something like a drive system would, so keep that in mind when planning its use.