Anybody seen this? It's from a german offroad factory. Even street legal!! For dd usage the DAS (double-add-a-leaf system) can be fixed at the rear frame (look close at the picture). Offroad it adds about 10 inches of flex. However it seems that the rear axle would be less guided with it. IMHO extended frame stress goes along with this setup. Does it work on a Fullsize? Opinions?