Just a heads up on a new truck bed cover called the edge tonneau cover by Truxedo. An economically priced roll up tonneau cover that has a single latch to open under the cover when you open your tailgate. Add an aftermarket lock on your tailgate and you pump up the security quite a bit. This is a nice feature. It has a velcro sealing system. Easy tension control  to keep the tarp snug. You can check out the edge tonneau cover at
TruXedo Truxedo Edge Tonneau Cover, TruXedo – Truck Bed Cover – Soft Roll Up Tonneau Covers