Diamondback SE with LineX
I really love these covers. I had one on my H3T and liked it enough to get one for my '14 Silverado. You don't see very many of these since the company is small and most of the covers are made to order (handmade in the USA!). There is a thick rubber seal which does a good job of keeping the water out - only a few drops from heavy rain or pressure washer. Mine is the SE which holds 400 lbs on top. The HD holds 1600 lbs I believe. You can get a kit that adds some rails and has some ramps so you can carry ATV's on top. Both the front and rear panels open so you have full bed access. If you have a load on top of the cover, you can still access the bed. Panel removal is a one-man operation - no tools needed. You can also fold the panel all the way over and strap it down. I believe I paid $1300. If you like the look of polished aluminum diamon-tread, it's $200-300 cheaper without the LineX. I know it costs more than a soft cover, but it does lock and keep your stuff safe & dry. Considering the cost of a fiberglass cover is about the same but less functional, this is definitely a good investment. Check out diamonbacktruckcovers.com. They have other configuations and more affordable covers if you arent concerned about hauling on top.