Google has a free software program called SketchUp (available here:
http://sketchup.google.com/) which allows to you fairly easily create 3D renderings of objects. Someone's done one of a Tucker (you can download it here:
http://sketchup.google.com/3dwarehouse/ ... b7e87f057e you'll need Sketchup to view it). Its pretty good, for the most part. There's some hard edge lines where there shouldn't be and a few other minor problems (the tailpipes aren't round, more like octagonal), but its still pretty neat that someone would do this.