The 2018 RAM ProMaster 3500 is available as a 3-door, 2-seat cargo van. Starting at $36,695, the 2018 RAM ProMaster 3500 Cargo is powered by a 3.6L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated The top of the line 2018RAMProMaster 3500Extended Cargo , priced at $ 39,445 , is powered by a 3.6L , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated