Fair enough have robust procedures in LVPs, but vacation reports for all runway crossings? Why give the Tower Controllers big tall windows if we are going to be filling up the RT with unnecessary verbage?
I'd imagine it'd be to give a prompt if you don't want to give the crossing vehicle your full attention e.g. giving clearances to other aircraft? Big tall windows are no good if you're looking out of another one.
I always had to report runway vacated when crossing a runway. Sometimes I'd have a controller ask me to "confirm you've vacated" or be told they'd seen me vacate - in these circumstances they'd be itching to get an aircraft away or issue a landing clearance so they'd have been watching me cross.