Make sure your truck is clear of poles, buildings, trees, signs, and any other obstructions that look as if they are sticking out of the truck. These things will draw attention away from the truck. Also, take the time to wash it-no gas station car washes-and make sure you clean or polish the rims. This is your chance to have your truck in a magazine. Take your time and make sure it's the best you can do.
Focus is the name of the game. Make sure the image is sharp. Using a tripod will keep the camera still and eliminate motion blur, but the focal area of the camera is all up to you. Try not to park the truck around other vehicles or obstacles that will be in the background, or cause a shadow, or reflect in the paint or chrome. Remove anything from the truck that will add confusion to the image or clutter the truck or background.
Lighting is another key factor. Shoot the image early in the morning or late afternoon. This will light the side of the truck and will allow even light across the truck. You will want to stand with the sunlight behind you. Make sure there is no one around the truck to avoid any reflections of your buddy picking his nose. Picture A is way too dark, Picture B is too bright, and Picture C is just right.
Don't cut the truck off. When you're looking through the camera, make sure you can see the entire truck inside the camera frame, and the truck should be centered in the viewfinder.