I had a 2003 3/4 ton Ram 4x4, now I have a 2012 Ram 3500 dually 4x4. I still tow the same trailer without any issues. First I have the shackles on the suspension up to the top bolt hole and adjustment of the pin box. I also use a B&W 3300 and it sits at the top setting. I measured the other day and I have 9 in of clearance. My truck squats about 2 inches with the loaded fiver. It rides level. My hitch sits just below my rails with at the highest level. My old RBW hitch sat way low and this is the problem that can be fixed but you need the proper hitch.