The Panzerjäger Tiger (P) Ferdinand/Elefant was a limited production lumbering beast, but with one mighty sting. Armed with arguably the best tank killing gun of in the Pak the Ferdinand/Elefant could truly reach its opponent out of touch.
The Nimrod was perhaps one of the first modern SPAAGs (self propelled anti aircraft guns), developed from the Swedish wedish Luftvärnskanonvagn Anti II tank. Altough few were built, it influenced strongly German army AA variants throughout the war.
Stug III in Russia. As you can see there is a zimmerit on this Stug. Zimmerit was a paste-like coating used on mid- and late-war German armored fighting vehicles during World War II. What you think about the Stug III.