A rear swaybar on a 4x4 can be a mixed blessing off road when you need all the traction you can get. I use air bags and Bilstein shocks to help control sway with the cabover off road. I did try to fit a Helwig rear swaybar once, but the mounting holes were so far off I took it back for a refund. I don't think Helwig has checked the mounting on a late model 4x4 Ram. I've seen posts from folks with pre 2000 model year Ram's reported no problems with the fit of the Helwig rear bar. Having the Rancho adjustables in the rear can be a great help also, I had them on my last truck/cabover and they work great imo.