I am deployed and do not have access to a cummins or I would do it myself. I need the width of the frame for a traction bar mount under the cab. I work in a fab shop and am going to be making brackets shortly for the trac bars I am building. My guess is a 4" frame but want to double check and get some more precise measurements. I dont think it makes a difference but i have an 04 QCLB and plan to mount between the middle and front of the rear door. Any help is appreciated thanks!