Playing on Genesis in the Arctic biome, and I built me a simple 3x3 trap out of stone foundations, stone stairs converted into ramps, and stone doorways. It might not want to get up the ramp, initially, and it's kinda slow, but it does hit hard, if you're just in fur. This one was lv90. Gonna try starve taming. But yeah, once it's in there, just keep popping it in the head with tranqs. It's big ol fat head sticks out above the trap, so you shouldn't have a problem with headshots. Hope this helps.
Best way to tame is have a crossbow with butt load of tranq arrows walk backwards tranqing it as you go every now and then you need to turn around to get a bit further away. I know this works because i have three mammoths that i used this exact stratigy on