Here is my sketch of the rack I am thinking of building. The grey lines are the heat tape. I currently have 2 racks that hold either 12 28QT tubs or 24 12QT tubs. I have seen a few big breeders (100+ animals) that do not use 41QT tubs at all so that is why I ask. My gut tells me to build to accommodate big girls but wanted to hear how many do without big tubs. I have 3 2000+ gram females that were bred and have ovulated this season in 28QT tubs but can see how if they get to be 4000 grams they might have an issue. What do you think (the rack will be 5' x 6').