Bearing in mind that the cross couplng of VHF and UHF frequencies is normally set up so that transmissions from pilots can be heard in vehicles but transmissions from vehicles cannot be heard in aircraft, I would agree with Zooker; initial call callsign only.
If you were to make a long winded transmission from a vehicle, it might prevent a pilot from telling ATC they have a problem (maybe requiring the attendance of emergency services) or prevent ATC from passing an urgent message to a pilot eg 'cancel takeoff clearance and hold position'.
So in my opinion, initial call callsign only giving the controller the option to say 'stand by' or 'pass your message'.
Last edited by chevvron; 9th Nov 2018 at 09:47.