Try this
Target races with 7-9 races only.
4 runners 1st.
5 " 2nd.
7 " 3rd. Cost $80@$1.00ea.

Calculation is done like this 4*4*5=80.
You deduct 1 off 2nd. sels. then deduct 2 off the 3rd. sels.
Keep this formula, you will need it.

You will need a bank of at least 80 times your bet beceause runs of 30 outs are common.
The odds will not be denighed.
You will find the first 10 in the pre-post market in the newspaper will dominate most winning trifectas.

Even with 7-9 runners you will find it challenging .
Do a dry run of at least 150 races with past or future results.
Try a method of sorting them in AVERAGE PRIZE MONEY ORDER,
its just as good as anything else beceause the place getters (2nd,& 3rds)quit often defy logic.

Check it out & share your findings.

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Cheers.