After a long time lurking, I finally found time and space to pick up building myself I picked up a 42009 and 42023 to supplement my brick-based Technic collection from the '80s and '90s with some modern studless. But considering my collection, my building style will be mostly "bricked".
I was inspired by Grazi's tow truck and the trucks of 2LegoOrNot2Lego. Specifically, I wanted to built a realistic truck with suspension, drivetrain, etc.
The skills of aforementioned gentlemen are out of reach for me, but nonetheless I'm quite proud of my creation:
I went a bit overboard with the features:
Suspension on all axles
Driven rear live axles
4-speed manual gearbox (based on this one from Sariel)
6-cylinder inline engine (hood and bullbar can be titled for access)
Front axle controlled with HOG wheel on cab
Working steering wheel inside cab
Motorized winch
Motorized double compressor with two airtanks and automatic shut-off switch
It's all a bit tight, but it all works well without illegal construction techniques. I'm not entirely happy with the linkage for the axle suspension: there is too much play around the vertical axis. Also, if you drive the truck backwards over a bump, you lose the front axle
More photos on Brickshelf and Bricksafe.