The Dominus, Royal Rocket League Credits Crown, Invader, Road Hog, X-Devil, Kana, Venom, Flamethrower, and Stern are also deemed non-tradable.  Summary. Players must be aware of the tradable and non-tradable value of all Rocket League items. Being a knowledgeable trader is the only way to protect your investment. It is also just as important to know the risks of trading items. ...