As Diana has pointed out above (and I'm sure these are National Regulations), you only need a log book, aka work diary, for vehicles of 12t GVM or higher, and only when over 100km from home. 
 do be careful with the 100km rule if you are splitting hairs, it is 200km in QLD and 0km in NSW, TAS have signed on to the "national" fatigue management system but keep putting the implementation date back (currently March this year but we expect further procrastination) WA is still not participating Perhaps stupidly, you can clock up as many hours you like in a light vehicle or close to home, and it won't apparently affect your fatigue levels when you get into a long distance heavy vehicle.
not true, work rest hours still apply, you just do not have to record it in the work diary - making detection and prosecution very difficult
Not more widely considered, but touched on above, is alcohol limits. It doesn't matter WHAT vehicle you are driving (ie Smart Car, Unimog, Kenworth), your alcohol limit remains the same. Your mate with only a car licence can be driving his Commodore at 0.045 and be legal, but you as a "Professional" driver (presumably with slightly higher skills/experience?) get busted driving his Commodore over 0.02. It is a licence condition (MR, HR, HC, MC), and does not get waived for lighter vehicles. 
I find that one hard to believe, please enlighten me where that comes from
I think Mick will tell you any time you drive a Commodore, you're likely to get busted. 

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