I hate how the rails on my other racks seem to warp the lips of the tubs over time so I wanted to try a rail-less system.
Long story short: We decided to start breeding regular rats in addition to ASFs. I wanted to try maternity tubs since I have already had a few litters get smothered to death in the communal tubs. This is the exact amount of tubs I wanted and I didn't feel like building two separate racks, so that is the reason for the weird design. The 2x4 blocks sticking out on the top are just there because I miscalculated the height.
I know this looks stupid but it's exactly what I needed and it is working great so far, so please control your laughter!