Anyone have any suggestions on how they balanced this second tier?  My husband and I are both pretty handy in the garage and he welds too so we can build something custom.. string to figure it out…  it won’t let me upload this photo so hoping the link works..

https://images.app.goo.gl/dnR647n6PcFZ9iyd6

that could be done with a hefty mdf board on the bottom and a flange then attach pvc pipe and cake plates -- using elbow joints and whatever kind of plumbing pipes and parts to get there -- so you make the stand then just set the cakes on -- watching the weight of the cakes so it's balanced properly -- and the way it looks, the top tier might be foam so there's less weight --

but internally there -- they used some plumbing joint to swing things over that direction

I am guessing this was done with a treaded rod, joints to offset, and bolts and washers to support the suspended tiers.  It would certainly require substantial structure, as -K8 suggested.

Definitely what SandraSmiley posted. It’s most likely a long metal rod. Running from top to bottom. Cakes are actually on a acrylic/metal plates threaded into the rod. Cakes are made offset by where cakes are placed.