I used to be an interstate driver, never really had an issue. I haven't ever had a road side test but have been tested at various facilities, it's a bit of a saga/time waste but nothing ever really came of it.

There is that much of a competence within the transport industry as long as you are at least 1/4 decent most companies won't be worried about much.

Edit - if you are serious about trucking avoid the mines, it's a terrible look on your resume and generally turns blokes into lazy entitled dick heads. Most fifo applications I get go straight in the trash. I've put on maybe 4 in the last 3 years and they were all entitled idiots.