I personally use 105 qt sweater bins for my rats. I don't like using the mason tubs just because I feel the don't have the proper room to be rats, and be comfortable. I was just wondering if anyone has ever seen these bins implemented into a rack? Right now I just have four of them stacked on one another, which is a little unstable but its fine. I would just prefer the rack style because I would be able to slide the tubs, and use an automatic watering system as well. If anyone could shed some light it would be great!