Firstly tradies are people like you if they dont like you they'll propably f2ck you around, so dont piss them off, they have the power.
Secondly If you havent got the guts to face someone about their bad driving your worse than them esp if you wanna key the ride, their bad habits show yours dont we can only see the results of a sick mind.
Now about tailgaters. I used to get the arse huggers in my shitbox 4cyl and let them pass, but now I can play a game with them where i slow down the closer they get, I then wait for the oportune moment and let them get beside me and then drop back to 3rd spin the rear in thier direction a bit then blast them off in 4th. i do it this way for 2 reasons 1st to check its not a cop trying to bust my import arse and 2nd to see the look on their face. It is fun and I only do it to the bad arsed %^&%$#s and yes I let them win if they keep pushing.
I have found that a tray backed ute is the best deterent to most traffic abusers.