Colorado is very windy...much of the time.
My old PUP Bag Awning could go out and remain out unless a thunderstorm rolled through...or a major weather front was moving through. In both of those cases, winds can hit 75 MPH or more.
But for most situations, the bag awning, if guyed off properly, could withstand winds of about 35 MPH (very common here). The rafter poles and vertical poles held the frame steady so long as I also ran guy ropes at a 45 degree angle to the vertical poles.
I've been using a variation on the bucket-o-water theme to help anchor my electric awning, but it's a poor substitute for rafter poles and vertical poles. I stake down "
tie down straps" and use a "
ratchet rope" (also featured in the SaveAwn kit) to tie down the awning roller to the tie down straps.
But the problems with this are significant. Without the vertical poles, one can't put much of a strain on the tied downs. And without rafter poles, the billowing awning phenomenon still happens. Finally, a downburst can still crush the awning frame against the side of the rig. So, for me, this means I can never leave the awning unattended while open...and by that, I can't go 100 yards from my rig, to the beach, when the awining's out. I can't get back in time to retract the unsupported awning before it could be terminally damaged.
I know from years of experience that a well supported awning can withstand quite a bit of wind, but the flimsy, flexible-flyer frames on electric awnings are extremely fragile. An electric awning with both rafters and vertical poles would be far more sturdy than one with just vertical poles. The canvas can withstand far more wind than the stock awning frame can.
Hell, my friend has an older Jayco with a manual awning that's far superior to mine. It has solid rafters, and 45 degree support go from the awning roll to the base of the rig...the whole mess is setup or folds up neat and tidy in a couple of minutes. He just pulls on a rope to extend the awning, and it retracts much like an old fashioned window shade. His awning is VERY sturdy. His is a bit more work, but I'd take his over mine any day, because he actually gets to use his.