The WKs definitely have a bit more room than the XK. I've seen a few WKs with 285s crammed in there; but wheel selection and actual tire size plays a huge role in how much trimming is needed at that point.

For the XK, 265s generally need some help fitting -especially if you plan to go offroad. If I wanted to run 265s on my setup I would have to remove my rear HVAC lines; my 245/75/17 will hit that area (wheel width and backspace doesn't help me here).

PS welcome to the forum.