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Assuming 45 pounds is correct for just the three segments combined, that already is a lot more than the single piece rubber donut/runflat - which puts 31 lbs on the scale. And all 6 pieces together I suspect may be twice the weight (!) of the rubber runflat.
(If I was the responsible buyer for...
Yes.
These wheels have 15deg bead shoulders with no safety humps - which means the tire beads come off very easy, once the air is out. But even at 20 psi, if you accidentally hit a curb, that could be enough for the tire bead to separate some from the rim, followed by a sudden (and dangerous)...