When tranqing. Place 5 or more large bear traps in a row between you and the rhino. Then stand behind the traps with the traps between you and the rhino and shot it. The rhino will charge and get stuck in the bear trap for 10 seconds, followed by the next and so forth.
We had a blueprint another tribe wanted so to trade they dropped a 150 in our base to tame, 6 hours later we had one of these bad boys, too bad when we got raided a quetz picked it and dropped him in the volcano