Interesting. It was my understanding that the official Toyota procedure involved lifting the cab and bed off the existing frame and transplanting all of the rest of the truck to a new frame.

This seems to outline the requirements: https://static.nhtsa.gov/odi/tsbs/2019/MC-10154787-9999.pdf

The warranty work is listed at about 40 hours of duration for frame replacement, which seems rather short to me. For about a million potentially affected vehicles that's not a cheap recall.