DETROIT, Mich (WLMI)  It's the end of the road for the Chevrolet Avalanche.  General Motors has announced it will stop production of the full-size truck after the 2013 model year because of slow sales.  GM sold more than 93-thousand Avalanche trucks in 2003, however sales fell to just 20-thousand last year.  GM will offer a special "Black Diamond" model of the Avalanche for the final year of production.