ecm car transporters

so i often here how good a paying job this is,is it myth and if not why do they always advertise and what does th ejob involve thanks in advance

I’m sure there was a thread about this last week, or it might not have been here… (not that there is anywhere else guv…honest!)

I think the consensus was that they interview but never appoint unless someone is an outstanding case.
Or I might be recalling entirely incorrectly and talking out of my…hat.