Considering this thread was started by someone in FL, and having heard the nightmares about trying to evacuate the state before the last storm came ashore, I can totally understand the addition of a reserve tank. Fortunately, diesel seems to be far easier to come by before a hurricane comes ashore than gasoline. When a storm is coming, I fill two 5 gallon jerry cans, and fill the TDI tanks. I can drive to Knoxville, TN on that much D2 if we take the MkIV.
I just read the entire thread, and we never did get pix of anyone's setup...