I Bought the ( undercover ) from a local truck accessory dealer , love it weighs only 58 lb.s easy on easy off water tight hard cover, tried to get water in the bed before loading the truck for work ,,, not a drop very happy with it cost $ 650.00 installed
If your looking for something low cost and tuff try extang. I have the classic platnum. It's a soft cover and has been holding up well for me. I like how the support bows lock into the bed rail clamps. There is no sliding of the bows as I have had with other soft covers. Price is right around $200.00.
It keeps whatever is in the bed dry, it is semi secure (someone has to come ready with a knife if they want to get in) It leaves the TruTrac accessable, but you do have to do some mods if you want to have the bed extender usable.
I have the BakFlip and very minor leakage. I did run drain tubes which were very easy to fabricate. I do no tneed a waterproof bed, but I wanted a lockable one. I also understand that they have improved their product this past year.
If anyone is interested I have a RETRAX tonneau Cover that's off of a 2005 KC, never had any leaks from it even through the car wash. It is about a year old, paid $900 will let it go for $400. If anyone is interested I'm in the Cincinnati area.