SRT-8AZ, you could try putting in the adjustable Koni's and higher wall 18" rear tires and wheels to smooth up the ride. I took the stock SSB SRT6 for a 3100 mile tour with my grandson in June and had no issues at all with the ride. I did several stints of 200+ miles without stopping and felt fine. (Just make sure you go pee before you leave! )

MikeR