The 2014 Ram ProMaster full-size van is based on the Fiat Ducato, which has been in production for more than 30 years. The ProMaster is available in two roof heights, three wheelbases, and four body lengths. Additionally, the ProMaster offers both a chassis cab and cutaway from the factory. It has a payload capacity up to 5,145 lbs. and a maximum towing capacity up to 5,100 lbs. The gross combined weight rating (GCWR) for the 3.6-liter V-6 is 11,500 lbs. and 12,500 lbs. for the 3.0-liter I-4 EcoDiesel.