I like the under the hood loops idea but my hood fits to tightly. I did add an eyebolt to the frame using an existing hole to provide extra distance from the muffler.   Don't all vehicles have tow hooks front and back as an integral part of the frame?

I have plastic bumpers so I use climbing runners (webbed nylon loops) to spread the pressure on the bumpers. Spring snap chain links attach the runners to the tow hooks and then it's a trucker's hitch to the canoe. The bumpers will move as I cinch down the canoe but the airbag hasn't deployed, yet.

Can you do ropes on the front only? I have to balance tension front to back but with a two-door, my rack only has a ~30" spread at best.

I strongly agree that you should be able to rock the car without the canoe pivoting or shifting on the rack whatsoever. Do it half-assed and you could kill people which could easily cut your trip short.

That loaded canoe pic is hilarious, but I'm sure the person who did it thought he/she had come up with an ingenious system wondered why no one else had thought of it

Even if it rode okay, can you imagine what would happen if you hit some heavy rain