I have the Yakima Skybox and at the time I bought it several years ago I believe it was their largest one length-wise. It fits with plenty of room to spare on front and back so no issues with liftgate on my XL. Their are 4 potential mounting positions for the cross rails, so there are some options as far as front to rear placement of the box also depending on the particular box mounting locations (which are typically adjustable to some degree as well)
Obviously the non-XL will have different roof dimensions, but I would think the box would have to be larger than mine to be problematic anyway.
If it would be of any help, I would be happy to send some pix of mine on the XL if you PM your email.