Provided one is willing to disregard Ram's published 8,800 lb GVWR and go by the FGAWR and RGAWR instead, then it could be a useful truck. If you wanted to plow some driveways and roads, you could mount up a 8' 2" Boss Power-V XT and still have some headroom on the FGAWR, and with about 2,700 lbs of headroom between an unladen truck and the RGAWR there'd be plenty of payload left for ballast/counterweight above/behind the rear axle. Hell, put it all behind the rear axle as a counterweight and that'd clear up even more headroom beneath the FGAWR, allowing one to carry some passengers, too.
In any case, the point is that it'd work… as long as you disregard the GVWR. (One could stay "GVWR safe", as it were, by specing a smaller plow, only the driver, and a small amount of counterweight.)
Yes, this is how I spend my free time... Anyway, for more on CNG vehicles in particular see this thread from our very own OT: http://forums.nasioc.com/forums/show...php?p=38420360