I don't trust them doing it, that's the thing, lol. They would screw up something. And I'm pretty confident I can do it. Looks a lot easier then other cars I've been working on, where you need to reach to engine bay or trunk or have another person to help you.
But I'm wondering if dealer can deny warranty repair on KDSS in case it goes bad because of lift install? I know they would have to prove it first. Also kdss alone is more than $650 not to mention I don't think there is any of Toyota dealers in my area with a knowledge or equipment to service this system, unlike Lexus dealers.
I was told by my dealership that their orders from Toyota corporate are to deny claims on anything related to the modified suspension. I've never had to make a warranty claim but it was made clear that if I did, they would put up a fight. You might try calling your dealer with a fake scenario to feel them out.