RE: Rough-riding
The SRT models will be set up to handle. The suspension will be firm but not rough. It will be night and day better than the heavy duty suspensions that were in the Challenger R/Ts.
I like retro, but why would you want to have an inferior set-up? That is one reason why I am buying a 2009 SRT Challenger instead of a restored 1970/1971.
Note: I read recently that the best handling car from the 1970s was the Boss Mustang. It, however, only accounted for .78g.