Easiest, cheapest method to knock out any level Rex is simply build 1 stone foundation,3 walls and 2 doorframes(no reinforced doors needed)....place the foundation down and the 3 walls in a U shape on the foundation then in the gap put 1 doorframe and the other doorframe on top....Then run up to the Rex tickle its balls and once u have Agro make a dash for your contraption run through the doorframe....Spin around, go into crouch and start firing tranq darts at it through the door frame( don't worry it won't be able to bite you as the doorframes are 2 walls high) This works on gigas too but go 3 wall high on door frames and use metal instead of stone. Hope this helps fresh spawns :)))
If you use the bear trap strategy which is if you lead it into a Dino gateway that is shaped in a triangle and with a bear trap in the middle (Large Beartrap) and when it is stuck you must put a dinogate behind it to trap it and then knock out.
The Rex are very slow . Put a stone gates around him while he is stuck and use a bear trap then put the x3-x4 stone gates then tranq him out . Make sure you clear the area before setting the bear traps others creature can spring it and u would be left with using your self or a tanky dino for a distraction
I would think these were gonna be harder to tame but they’re actually not that hard, my stamina and movement speed is pretty high I’d say around 200 or higher but I didn’t need a trap or any of that, all I used was tranq arrows, u shoot it once then run away for a little bit turn around quick shoot it again then run away again and shoot it again and repeat, if it starts running it means it’s almost knocked out just chase after it and keep shooting and feed it meat!