Good question! First, download the spec sheet you see here. Fill it out with as much information as you can, then e-mail it as an attachment---along with images of your truck---to editor@readerrigs.com. We must have high-resolution images for publication, however---image size must be at least 640 x 480 pixels at a resolution 300 dpi, so thumbnail pics, cell-phone photos and the like just won't cut it. General rule of thumb: If your digital photo is 1 MB in size (or bigger), you're good to go.
Otherwise, download the spec, upload some photos, and look for your truck in the next issue of Readers' Rigs!
What could be simpler?