The ambulance company I work for use mainly van ambulances. We also have two "box" ambulances with special stretchers for "large" patients. The stretcher has wings that attach to the sides and a special mattress for the patient to lay on. This stretcher seems to fit any ambulance with a center floor mount to give the wings the space needed. Other times, without the wings, the stretcher is the same as any other. This is cheaper than buying new special ambulances. The stretcher is also rated for 700 pounds.