Trailing stops is always a big dilemma. Having a big stop gives you bigger average losses, having a small stop gives you more of them. When testing automated systems I have found that the great majority of times, a bigger stop will improve results by a great degree. If you decide to daytrade the S&P, take a look at the stop I use as described in my manual (free) which is downloadable at www.sp-levels.com You can also give the TrendLevel indicator a try (currently free). All the best, Phil
Let's conclude: Asking about stop and trailing stop is almost equivalent to asking how can I made a trading system that works