11. Maximum Capability Official J1 Engine 2018 Ram 3500 Trailer Towing Chart J1 – SAE J2807 Compliant Trans. Axle Ratio GVWR Payload Base Weight Total Front Rear GAWR Front Rear GCWR Max. Trailer Weight Rating CREW CAB LONG BOX, 4X2, SRW, BOX OFF 5.7L V8 HEMI A6 66RFE 5.7L V8 HEMI ...