I'm not sure what that question is getting at, but let's look at what a 1 man and 1.5 man stretcher is.
A 1 man stretcher is a stretcher that can be loaded into the ambulance by 1 person alone. They tend to be like the ferno "Z" cot http://www.ferno.com/zcot/
Once the rear wheels are on the floor of the ambulance, you pull the release handle, and push into the truck, and the legs swing under the patient.
This is all in comparison to 1.5 man stretchers that require a second attendant to load. These cots tend to be "X" frames. Once the rear wheels are on the floor, the attendant at the feet picks up the weight of the cot and pulls the release lever, while the second attendant lifts the legs, and the cot can be pushed into the ambulance.
THis is all in comparison to the older "2 man" cots, which required 2 attendants to lift the stretcher from the ground onto the floor of the truck, but I dont think these exist anymore.