My '03 quad cab, short bed also had the plow package. However, the plow prep may not be available on certain long bed/quad cab configurations and definetly not on the dually 3500's. As in rbattelles case, if my memory serves me right, his 6 speed may be the reason why he was red flagged on the plow prep.
I will also stick to my guns in regards to the alternator issue that I have posted about in previous plow prep threads. The point being the Cummins equipped trucks all come with the same alternator regardless of plow prep packages or not, and too most peoples horror it's only in the 130 amp range.
Also, I have posted my spring #'s before as a reference tool to put this spring debate to bed once and for all. Here they are again for those interested. Front drivers:986AA and passengers:985AA. All three of my 3rd gen trucks have had these spring #'s and all were 2500's with the plow prep option. Two were Quad Cab shorties and the other was a regular cab long bed. To add to this, I have referenced a few non-plow prep equipped trucks on my dealers lot and the front spring #'s were different than mine.
So here is my final conclusion on this topic. The plow prep for a diesel Ram consists of different front springs, a skid plate, and the blessing from DC to hang a plow off your truck as long as it's under DC's weight limit.