Rear suspension: Carbon fibre double wishbone arrangement, with carbon fibre toelink and pushrod. Pushrod activates rocker, torsion bar, damper and anti-roll bar assy
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I don't know of any solid axle suspension that uses double wishbone or toe link for that matter.
If it were a solid axle, they would not be able to adjust the rear toe or camber. Two very critical settings to nail the right set up (not that Toyota can do it anyway). Cornering G's would rip the chassis apart if the rear suspension could not flex independently, especially when bouncing over curbs.