I actually had the Extang RT on my 2004 Ford F150 Supercrew before I bought my new car 2 years ago. When the temperature would change summer/winter you will need to adjust the screws to either tighten or loosen the cover depending on cold or hot temperatures. I used
303 to keep it conditioned and protected from the UV, as my truck sat outside. It has Velcro strips on the side, so don't expect it to secure valuables in the bed of your truck. Also, it would be easy for someone to cut the top and get into the bed of the truck. The main reason I went with the soft top over a more secure hard top, if I was out and about and bought something large, I could always roll up the top and put the large object in the back of the truck. I did this many times. If you have a toolbox in your truck, it needs to be a chest type, over the sides type will interfere with most tonneau covers.