Two Pickups with more similarities, such as the body structure, ground shadow size, height, and maximum occupancy, than differences, like the starting price and horsepower. First of all, there is a $6,855 difference in the base MSRP. The 2018 Ram 3500 Mega Cab has a higher starting price than the 2018 Nissan Titan XD Crew Cab. And finally, the 2018 Titan XD Crew Cab has a more powerful engine than the 2018 3500 Mega Cab. Among similarities are the body structure, ground shadow size, height, and maximum occupancy.