You will know if you need springs when you hitch the trailer, put the horses in and then see if there is still spring left at the bumper. If the trailer just pushes the back of the truck down you WILL need something back there. There are several options, but putting in another leaf spring is a very good, permanent solution. Asking someone in a shop won't answer that question. I've had springs installed on two trucks now. It isn't difficult or expensive to do.