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Louise I can't answer for Caitlin but during my own time spent working in the funeral industry we used hydraulic trolleys. One funeral home I worked in was built over several floors. The coffins were brought in from the rear car park into a 'holding chapel' on the lower ground floor (a plain white room with tile floor). The viewing chapels (nicely decorated where families came to say goodbye etc) were on the upper ground floor. There were hatches in the walls covered by curtains. The coffin was placed on the lift, raised up, then slid into the viewing chapel. It's possible to do with only one person but two are recommended.