And here is my crack at the truck. That was much fun and an easy introduction to most of the tools. Now, I need workflow advice on making more elaborate forms and recessed shapes and surfaces.

A couple of problems I had: 1) I drew a spline using polyline, line and arc, joined them and extruded but could not "skin" the major faces despite checking Caps, trying Planar and rebooting. 2) I was not able to group objects such as the ladder parts or the wheel, cap and axle.

Oops! I just noticed that one of the end surfaces got deleted somewhere along the line.

Added material via VrayForCinema4D.