Not exactly the best pictures but hopefully will give you some idea. This rack is Gravins expedition rack. As it comes from the manufaturer, it is made to tilt back so that the hard top can be removed or the soft top folded.
With my setup, I've got an air compressor mounted in the front middle (power cables run down the front right support to the battery so I can't tilt it back) and full length air tanks on each side. Even with that permanantly mounted, I can still put my camp kitchen, stove, tent and four camp chairs in one level in the bottom of the basket.