The quad cab is a new RAM 1500 series vehicle with a standard legroom space but wider cargo space. It has a space for up to six passengers, but if compared between crew cab vs. quad cab ram has a small space and smaller doors than a crew cab. That’s why the quad cabs are mostly used for commercial and loading purposes. The features of the quad cab are basically in between the regular cab and crew cab, and its process is also between these two vehicles—the only difference between regular cab vs. The quad cab has two extra doors and an extra row for seating than a regular cab.