The people at Car Question performed a diagonal test for the Kia Telluride's all-wheel drive system and I think it handled very well for a 7-seater SUV.
The Telluride was able to handle diagonal climbing in Smart driving mode along with snow, sand, and mud terrain modes with the traction control on which was great to see.
But thing the test showed was that the Telluride will struggle, regardless of what mode it's in, if the traction control is turned off. I'm not someone who turns off the traction control but it's definitely something to make a note of.