You never answered the (other's) question of whether or not you got the composite bed. If you did, is it slick? Rhino will keep stuff from sliding around stacked one layer. The second layer will still slide on the one below and so on. If you aren't going to have a cab wall tool box, then either get a drop in liner or cut a piece of plywood (preferably 3/4") to protect the forward wall of the bed. One helper, no matter how good a friend, client or employee only has to let a 2x4 slide
2 or 3 ft to leave a nasty dent. A drop in will probably stop that. 3/4" ply will. Definitely, every time. Paint it the color of the bed and leave it lay, or leave it at home. Keep it painted and it will outlive your truck. Spend the xtra money, for a 1/2 sheet of marine 3/4, don't worry about painting it, and it may outlast the roof of your house. And the best thing is, You can leave it laying in your garage until you need to haul lumber.PS all ways, always, and every damn time, haul lumber with the tailgate up. You can't haul more with the tail gate down, you can only haul what you suspension will carry. The ass end of your truck will be lower than the front by that point, yet you will still have more than enough torque to leave your load in the parking lot of the lumber yard, or worse, in an intersection somewhere. As a carpenter, I see this too much. As a former medic, I can't believe I haven't seen someone hurt from it yet