Drivers just love talking about pay. We never stop talking about it ! Who get's paid what, how many hours overtime, which TOC get's more/less. Staff turnover (due to pay), what I took home this month, which department got a pay rise, job news, EU holiday pay, rest day workers, sick pay, retirement numbers, medical payouts, part time pay, etc. etc.
We work in an industry where our wages are very very public. (not always reported correctly). At my TOC; all salary 'bands' are posted on the notice board.
It's not even seen as crass. Pay discussions have always been pretty open; especially as we are all on the same pay.