For me,I prefer the Type III (box type). Sure all ambulances are top heavy,but with the Type III U have more head room,as compared to the Type II (van type),where you have to almost bend over just to work inside of it. I've ridden and driven both types and I am not impressed with the type II. Type II ambulances may be thinner and easier to get into tight spaces,but when you are working on a full-arrest patient,you need every ounce of space to work with. I also dont mind the medium-duty style of ambulance,I like the size and they are intimidating as hell and offer a little bit more room than the Type III,they are more or less preferred by paramedic services. If I had my own service,I would want at least one medium-duty unit in my fleet.