I've seen awnings strapped-down many times, some with a large nylon strap across the awning in addition to tie-downs at each end. A cousin does something different. His trick? He never ties it to the ground, instead he carries some 5 gallon pails, hangs them from the awning roller supports, fills them with sand. He said he has never lost an awning in nearly 20 years, and has camped in every state of the union, except Hawaii. He said he has never stowed the awning because of wind, or lost one.
Me? I stow the awning each night before retiring, at a hint of strong wind, or when we leave for the day. I don't like the trailer rocking when wind catches the awning, especially while sleeping (I'm an old ground soldier).
I've also seen several awnings blown away in wind ($$$$).
2000 Winnebago Ultimate Freedom USQ40JD
, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member."We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert theConstitution. "Abraham Lincoln"