Knaack improves the design of its roof-mounted ladder rack equipment used on commercial vans and minivans. The new features enhance the durability of Weather Guard Quick Clamp Ladder Rack units while making it safer and easier for one person to load, transport and unload ladders, as well as other oversized items carried on the roof racks. Improvements include modifications to the mounting plates and the front rails to protect ladders when loading and unloading; and beefing-up the clamp mechanism for added strength and longer life.