I don't actually put trifectas on every race, but when I do, I do prefer to box them. Either a 4 horse box ($12 for 50c unit) or a 5 horse box ($30 for 50c unit). Today, I was lucky to get a few good results with 4 horse box trifectas, but in the last at the Sunshine Coast I used a 5 horse box adding number 4 to the 4 tips I posted here.

There are a few other trifecta options I look at:

If there's one horse I'm VERY confident will run a place, I might use it as a roving banker with 4 others ($18 for 50c unit) or with 5 others ($30 for 50c unit).

Otherwise, I will look at using the following:
2/5/5 $12 for 50c unit
3/5/5 $18 for 50c unit
2/6/6 $20 for 50c unit
3/6/6 $30 for 50c unit