You may need an "awning lock". After my patio awning unfurled while I was speeding down I15, I got serious and bought one. Search on RV.NET for "awning lock". You could also do a Google on that. I bought 3 from an online company. Eventually sold the other two to friends as I was too lazy to put onto my slide toppers.
I have a manual patio awning, so adding the lock was not a big hassle in terms of the opening process. With respect to the slide toppers, I would have to remember to go out and unlock each before opening the slides. Not sure I would remember. Also, I haven't had a slide topper unfurl problem that required me to change my mind.
Jerry Keller2006 Bounder 35E, W22