I'm also a Duraflap fan. Had them on 5 different trucks. Bought my first set when they were working from their garage.
Easy installation.
They do make a nice flap, but they are way too stiff for my driving style. I don’t do anything crazy, but do spend a lot of time on back roads and the stiff flaps just don’t like sticks or larger rocks.
I had them on my 05 and could never keep the screws tight. I surmised that the stiff flap vibrated more in the wind. I eventually lost one and removed the other 3. I tried to contact duraflap for a replacement flap and hardware but never got a response. Oh well, went with different flaps.
I kept those 3 and will make flaps for my trailer out of them, but I won’t put them nearly as close to the ground.