Here's a cheap trick that results in great details. Not just for trucks, but for any model, any scale. The scale and spacing of the rivets is determined by the size and spacing of the comb's teeth. Any pharmacy has an incredible collection. Tiny mustache combs, curved berets, BIG combs. Any size. This is on the tail of a 400 size Apache Heli. It's just Elmer's wood glue. When it dries it dries clear and is compatible with all paints. You can spend a lot on sheets of stick-on raised rivets but this gives you the same effect for the cost of a comb in a fraction of the time. If you make a mistake you can wipe it off with a moist cloth before the glue sets and re-do it.