I drove truck for 4 milion miles. What's a chassis cab? I know what a class 8 is and a cabover or conventional. I actually know what it is, a light truck. However you put it, DEF is just as nasty as diesel soot.
DEF (Diesel Exhaust Fluid) is a 32.5% solution of Urea (NH2)2CO. When the urea solution is injected into the hot exhaust gas stream the water evaporates. The urea thermally decomposes to form ammonia and isocyanic acid: It hen goes into a humans lungs and crystalizes and never leaves.GOODBYE ALL!