A good way to tame a Bronto is make a pillar that is higher than a bronto with a hatch frame then make a ladder to go to the top and make some cielings to snap to the hatch frame to walk around so you can freely shoot it from angles and easily tame/kill a bronto
Bronto are slow just shoot shocks or tranqs and walk backwards. Use large rocks to jam them they struggle to cross non flat terrain. Use EXCEPTIONAL kibble to tame high levels or you will be waiting 5-10 min even from starve using berries or veg.
Bronto can carry as many people as you like with or without platform saddle aslong as weight limit is not exceeded. (There is no seat for passangers to mount)