Wow guys. So not true.
It's extremely easy to hook up at ANY angle - even 90 degrees. Arguably, its even easier then trying to line up and back into the hitch in a megacab since you can't see over the back seat real well. It just takes a different approach is all. You remove the two pins from the hitch head, install the head on the pinbox of the trailer (15lbs?), back the truck under the hitch head, spin it to whatever angle you're at, lower the coach back on, and replace the pins. That's as simple as it gets...even at 90 degrees.
(On edit) The hitch head is a 4 way too. So even unlevel ground. Let's see other hitches hook up under any condition at 90 degrees.