Tuft & Needle Bed foundation; full size. This is basically brand-new. It's been used maybe 4 times in the past six months. We bought it with the T&N mattress for our guest room, but decided we'd do better with a low-profile foundation.
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See the real thing at https://www.tuftandneedle.com/basics/box-foundation/. It comes apart easily and effectively, so could fit into a compact car with room to spare. It takes about 6 minutes to put together or take apart and requires no tools at all -- I had it completely apart before I thought that I should have taken a picture or two before doing so.
I can meet at a public spot in the Ithaca area if that's helpful.