looking at a new truck and need help. I have a 3500 ram dually 4x4 8' bed towing my 4200 King toy hauler. Never had problem pulling. I'm looking at a MEGA CAB in the same truck, I've heard that I can not pull my trailer with a mega cab, also was told that I could with a slider hitch?? Any one have a mega cab hauling a big fiver??