Allows you to backtest a simple percentage based trailing stop, with a trailing buy. Experiment with different percentages on different timeframes for different charts.
For BTCUSD, on daily 4.3% stop and 1.9% buy works well, while on 4hr a 1.5% stop and 1.9% buy works best.
Please comment with any other combos that work well for you on different markets or timeframes.