It’s actually a lot more simple to tame these guys then I thought. I just used tranq arrows and some narcoberries on hand. I then ran up close enough the Trike and hit him with a tranq arrow the ran away until he stopped chasing me, then I ran back and shot him again, I repeated this process until he started running from me, then I could keep hitting him til he went down without having to run away. I put the narcoberries in and just waited. Viola, now you have a trike. (Note it took me about 12 arrows)