The Superior Chevrolet wide bodies were very squirrely on curves and on ice. We used them in inner city Minneapolis and out in the suburbs and beat the crap out of them. Felt a little odd when you first got in to drive as seats were in the normal positions for a van but the doors were extended out. There were wide arm rests. It made for unnatural maneuvering in tight parking lots and ER entrances. So there were frequent parking lot mishaps for new drivers.
The transition was from M-M Cadillacs to Road Rescue Type I modulars on single rear wheels, (not tandems) to these wide body Superior Chevrolets, finally to Type III's on Ford cut-away chassis from several different builders like Braun, Modulance, American Coach, and Road Rescue that were a lot better.
The wide body Superior Chevrolet ambulances had 350 engines and were very noisy. Over time, lots of air leakage around the engine doghouse so very cold in the Minnesota winter. They were rattletraps. I have no fond memories of them like I do for the Cadillacs.