Does anyone really really think that after declaring an "emergency" or a "mayday", that there is a need to ask for "roll the trucks" or "request emergency services". As soon as ATC hear those words they push a little red button connected to the fire station and before you can finish your R/T those guys put down their volley ball, car wash bucket etc and jump into their shiny fire engines to meet you. Can we PLEASE put that one to bed.
Multiple times in my round motor days, after advising ATC that we were declaring an emergency and shutting down an engine, when handed over to the tower we were asked if we wanted the equipment standing by. We'd decline but ask them to check with airport ops to see if they were setting up an escort for a tug and towbar. Eventually I got enough practice, I could taxi a DC-3 across DFW on one engine.