RepairPal Certified shops can diagnose and repair your 2020 Toyota 4Runner. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
You should stick with the 265-70-17. The reason is that not only your tread width changes, but also the outside diameter of the tire changes. As a result, problems can occur. If Toyota thought it would be OK, they'd have made this the size!