@gotsmart interesting that you have an actual skid. It's got some wear but not too much.
In my case, I don't think the receiver can go higher without needing to go through the white bumper because it would be mounted atop the crossbar. It looks that the configuration is different between the two rigs.
But look at how the designers figured out for your rig that the wheels needed to be pushed back and a slope added to the rear overhang, as well. Your rig is longer but those two changes increase the departure angle a lot. As someone else pointed out, the geometry of my rig simply doesn't give me much to work with—which is another good reason to keep my changes to a minimum. Anything I do won't change this rig's departure angle much.
@memtb thanks for those pictures! That's what I was thinking of (though I remember one even wider; no matter). Interesting how your roller is mounted beneath the receiver hitch. The only thing with that is that the bottom of the roller is about the same distance from the frame as the bottom of my wheels. Changing to a roller reduces the chance of a wheel getting into a hole—but it doesn't buy me any more inches/increase my departure angle :-(.