Here is my first model for the TRIPLE contest
Granted, not particularly original.
Features
-openable doors
-tiltable cab
-ackerman steering geometry
-inline-4 engine
-pneumatic lifting rear axle
-pneumatic tipping bed
It measures in at roughly 550 pieces in LDD, sans the pneumatic stuff.
I could get it below 500 by removing the engine and it's driveline and attachment, if 550 is too many pieces
I haven't decided on the two remaining models, but have a couple of ideas that are more original than a simple truck