This has been a good discussion...
1)so far I've been reminded that I can't spell I'll bet that 99.44% of the Truck camper regulars knew it already
2) and that I'm not an engineery that's right, I'm a retiree
3) I read that some one else noticed the lack of wind blown dust in the air in the pictures But Janet and I, while in bed in our TC survived a 108 mph down draft straight line shear wind in Sandusky, Ohio. it hit us in the rear drivers side corner... for a miniute or so it shook us in every concievable way. The happijac's held. (I posted on it at the time... it was fall of 2005)
What the OP could have had is a sheer wind that was over in seconds.
Since we don't have a wind tunnel to repeat the same conditions over and over making only one change at a time using different tie down systems we can't say with any certainity what is best, or if there is any difference in the tiedons at all... at this point it is just conjecture.
I do understand research methadology. And I understand when a guy claims to be a quarterback... armchair of course.
Even an educated guess... is still a guess!
sleepy