Although there are some similarities, these two are different in most aspects such as body structure, maximum occupancy, horsepower, and ground shadow size. First of all, there is a significant difference between body structures and exterior dimensions. The 2016 Ford F-150 Regular Cab is a Pickup, while the 2015 Ram Promaster Cargo is a Van. It is also slightly smaller. Also, the 2016 F-150 Regular Cab pulls more horsepower than the 2015 Promaster Cargo Van. And finally, the F-150 Regular Cab seats four more passengers than the Promaster Cargo Van. Among similarities is the starting price.