Just one piece of advice about style for everyone - when we're evaluating pictures for calendar shots on ORTB, we look at every pixel. Not only does the TRUCK have to have the expected appearance, but (almost more important) the BACKGROUNDS need to be composed with some eye for style and distractions.
Posing in front of a telephone pole that looks like it's growing out of the truck, a background that changes patterns (brick to plank, sand to rock, and so forth) or being photobombed by a boat on a lake that you could have waited 30 seconds to let it get out of the frame - all those things are what separates a snapshot from a stylish composition. And that's what this contest was about, as I understood it.
Just some advice to bring everybody's submissions to that calendar-worthy level.