Thule Omnistor wind out awning

As it is now becoming an effort to erect the Magnum Porch awning we are considering the Thule Omnistar 5200 4. 5m for our Buccaneer Cruiser, but in order to avoid issues with wind we will probably also buy the Panorama "tent" bits so that it has sides.  

We can then leave articles inside plus we have three dogs so can contain them if necessary.   We like the idea that it is quick to wind out and can be held in place with 4 guy ropes for mild wind conditions if just using the shade part and not the sides.

In addition to wind, the concern is the weight on the caravan as the Omnistar is bonded to the roof of the caravan?  Also are there any detrimental effects if you wind back the awning while it is wet?  We have never investigated the wind out awnings as we been quite happy with our traditional Magnum Coal so any suggestions positive or negative would be appreciated.

Air awnings are totally out of the question as we cannot manage them.