Knaack LLC announces improvements to the design of its roof-mounted ladder rack equipment used on commercial vans and minivans. The design modifications pertain to the WEATHER GUARD® Quick Clamp Ladder Rack and the Nissan NV Ladder Rack units. Improvements to the Quick Clamp Ladder Rack include modifications to the mounting plates and the front rails to protect ladders when loading and unloading; beefing-up the clamp mechanism for added strength and longer life; and improved engineering of the gas springs with a tougher exterior case to withstand wear, and internal brass bushings that prevent strip-out. For more information, visit www.knaack.com.