i think that using trailing sl is very usefull to use coz when the market in running in ur profits then you can make trailing sl to go in thyat direction and if it moves more ahead then trail it more ahead coz if the market suddenly moves opposite way then you can have the profit already locked, but then you better dont have thoughts like the market could have gone more up after a small dip, coz that will, just increase your confusion and also the fact of small cut from ur profit's.