I've been using an AP CB70 rack for about 2 years now (12 stack) and really happy with it, photo below. Got my tubs from Amazon (Sterilite 19608006 41 qt).
I wouldn't recommend putting anything heavy on top of ANY plastic rack or cage, as over time they may sag which can cause the tubs to stick. I am not saying this would happen with the AP (it's very thick compared to my proline and boaphile caging which sagged) but just something to keep in mind. You may want to ask Ali at AP their thoughts on weight limit for stacking on top if you want to pursue going with them.
Good luck with whatever you decide to go with! They would probably both do great.
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