You are right that you should never be happy to tie the boat just to the rack. I had a Yakima tower fail at 70 mph and it stripped the carrier and boats off of the car in one piece. Fortunately, while the boats and rack were destroyed, there was no one behind so I did not kill a van full of nuns with that stunt.
I am not sure, however, that you need to have two bow and stern lines to keep the boat from moving sideways. The racks in the video are like the ones I use and they have mounts that lock in the sides of the canoe and stop lateral movement. Of course after the incident above, I run two straps off of each end anyway because I know my luck is limited and largely exhausted.
Paddler's Truck Rack
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