I suggest (this is from personal experience) that in the early game in the southern areas use a slingshot and a big rock to cheese the fight and tame it, then level up the trike only in HP, then go to the shallow flatlands neer the green monument thing and Kill every carnivore,dangerous creature,or anything that gives high tier loot (you don’t need to be high leveled 500+ Hp and you can take out thing even as powerful as a rex).