I purchased the Lomax from Truck Alterations in Waynesville NC. Your neck of the woods somewhat. I've been thru some serious, serious all day rains a couple of times out on the highway and mine just gets a FEW drops in the tailgate area. Nothing to get excited about. It's about as secure as you can get for a bed cover. I knew I didn't want another soft cover. They are well built, easy to install and fit right. IF you have a drop in liner, then you will have to trim the upper outside corners of the liner just a wisker to allow for the tab. It weights about 60LBs, a minute or less and you can take the cover completely out of the bed and out of the way. I'm glad I listened to all the recommendations in this forum and purchased one. Need more information PM me if you want.
The main website is Agricovers. An Iowa based company, in my neck of the woods.