I measured my frame rails a minute ago and took a good look around. They are 36" apart and it need to drop down at least 2" to clear the spare tire well.
Move out 1 bolt hole and only use 3 on each side instead of 4. I have built an extension/riser to go into receiver before bike rack, out 1 foot and up 18"!
Good Luck..................See pics on other thread.