The Ram boys should have a forum, of course. Just not this one. Vipers are sports cars and this is a place to discuss Vipers. Rams are trucks. Fast trucks, perhaps, but trucks nonetheless and they don't really belong here.
Regarding the Cayenne and the PCA. I don't know if Cayenne ownership entitles one to be in the PCA, but my guess is that it does. And that makes sense. The PCA is a club for Porshce owners in general and the Cayenne is a Porshce; if you own one, then you own a Porsche and it wouldn't make any sense to refuse membership. If, for example, there was a 911 Owners Club of America, its a different story. It wouldn't make sense to admit Cayenne owners to the 911 OCA because, well, they don't own a 911. That doesn't seem like rocket science.
By the same token, this forum and the VCA is for Viper owners in particular, not Dodge owners in general. That is why it is call the Viper Club of America and not the Dodge Club of America.
The Ram SRT is kind of a neat vehicle and its owners deserve a club and a forum. Just not the VCA and this forum.