Nuts, for your truck! Slap them on and instantly let everyone know you and your vehicle have big balls!

Just use something like Hanging prominently from the chassis beneath the rear tailgate are small, bright pink novelty trucknuts in your prompt along with a vehicle.
It understands small/large, and any color or pattern you could ever want, including metallic CHROME!

Telling it to make extra large can quickly get out of control. Please nut responsibly.

V1 for Krea 2 has some issues. If there's a ton of interest, I have ideas on how to fix them for a v2.