Toyota, like all auto companies, sends expected mass, cg, and wheel travel measurements along with a price point and reliability requirements to a shock company like KYB or Bilstein while the car exists only in CAD. Later the Toyota is sent several options and decides between them after a couple weeks, maybe a month, of driving around a couple test mules. Every reputable shock company does more testing than the auto manufacturers. This is how modern manufacturing is done, you piece out design and manufacturing to specialized companies that compete for your business. Toyota has high stds but if you think they are doing in house suspension development then their marketing dept has succeeded and fooled you despite your excessive student debt.
Fear the Tree! :biggrin1: