Yeah my approuch is do as much as you can while they are still young.
As a weanling(or before)..clipping,bathing,loading,trying,crossing the creek,walking down the road,picking up feet,sacking out.
As a yearling ...poning, trailer rides, saddling, hobbling, longing, driving, blanketing, showmanship stuff (haunch & forehand turns, sidepassing,two tracking,backing up,setting up)
Before I even got on her she had been hauled to about 12 different areanas.It really payed off.