In advance: Make cookies. Prepare and roll out dough. Using patterns, cut 4 wheels and 1 tiered cake; bake and cool cookies.
Ice tiered cake smooth with royal icing. Pipe tip 5 zigzag icing drips on each layer (smooth with finger dipped in cornstarch). Pipe tip 2 message. Sandwich 2 cookies together with icing to make each wheel. Cover wheels with thinned royal icing; let set. On wheel, using pattern, outine hubcap with tip 2 and full-strength royal icing; let set. Flow in with thinned royal icing; let set. Cut 2 in. dowel rod sections and attach 1 to top half on back of each cookie with royal icing; let set.
Also: Make puddle dot lug nuts and axle, 1/4 in. diameter, on waxed paper using thinned royal icing. Let set.
Bake and cool cake; cut off bell area on top. Ice cake top smooth in buttercream to level; mark pattern with toothpick. Ice sides and background areas smooth. Outline pattern areas with tip 3. Pipe in headlight, window and fender areas with tip 3 (smooth with finger). Cover truck with tip 16 stars. Overpipe bed area. Overpipe tip 16 outlines on bed. Pipe tip 18 shell bottom border. Using tip 2 and full-strength royal icing, attach lug nuts and axles to wheels. Position wheels and tiered cake.
The star tip creates the most celebrated, easily accomplished decorations! The serrated edges of the star tip make ridges in the icing as you squeeze it out. Because fill in requires so much piping from the same bag, keep replenishing icing in bag.
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