Bulk bin feed trough

I get Brewers grains from a local Brewery for my cattle. I get them in the mini bulks that I cut like in the picture shown. I usually just set them in the pen with them the problem being it gets covered in mud, crap and a whole bunch other stuff that I then have to spray off before bringing back...I was thinking of making a fence line feeder where I can just have spaces in the fence where I just put the bins on the outside. do you think the cattle would be able to reach the back and clean them out before I have to bring them back?

Bulk bin feed trough