The hitch is installed and I am pleased with the final result. I also learned that either my frame or the hitch itself is slightly out of square. I suspect the vehicle, as the previous owner told me he had the back hatch repaired five or six years before I bought it and I suspect the bumper was replaced as well. After spending time inspecting the repair (and still repairing it), I wouldn't recommend that shop if I knew the name of it.
I spent at least 15 minutes wiggling the hitch around until I could get the fourth bolt in. Once I got it started by hand, everything came together quickly enough. I do wish I had air tools to get these repairs done more quickly.
A tip for those attempting the hitch install: It is best (and easiest) to install the hitch with a helper holding the other side of the hitch. If you, like me, had no help in the middle of the day, then two jack stands will do the trick. Here's how:
1) Without the vehicle lifted, position the two jack stands behind and below the bumper. (wrap the tops of the jack with shop towels to protect the hitch's finish or use jack stand caps like I did)
2) Put the hitch on the jack stands.
3) While holding the hitch so that it won't tip forward, raise the driver's side up two notches
4) Move over to the other side while making sure that the hitch doesn't fall off the jack stands
5) Carefully ease the passenger side of the hitch over the exhaust tip and raise jack stand to touch the hitch. You can't avoid scraping the hitch against the tip without a helper to pull it down.
6) Raise the driver's side some more and get the most forward bolt three or four threads in by hand
7) Do the same for the passenger side front bolt
8) Back to the driver's side for the rear most bolt
9) Passenger side rear bolt
10) Once you have them all hand started three or four threads in, put in the middle bolts
11) Ratchet up the middle bolts until snug, then do rest of the bolts until snug
12) Use torque wrench to finish it all.