The Ram Power Wagon is the automaker’s heftiest version of its heavy-duty pickup truck, but with one huge caveat: there is no diesel engine available. According to a Ram powertrain engineer ...

Ford and GM's heavy-duty off-road-ready pickup trucks all offer diesel engines, but that's not the case for the Ram Power Wagon. Its sole engine option is a gas-powered 6.4-liter V-8, which is ...