When properly installed on a 2004-2007 Scion xB, the receiver opening sits level and does not angle down. I have included a link to a video install on a 2008 xB so you can see how the install works and how the hitch sits. view full answer...
If you have Rhino-Rack Aero or Sportz crossbars on your vehicle then the Ladder Mounting Kit, part # SEGLK2B will work great for you.
If you do not have those crossbars on your vehicle let me know and I can see if we have something that will work for you. view full answer...