This disclosure relates to systems and methods for aiding in the launching and/or loading of a watercraft on a mobile trailer. Various embodiments provide for an aid system that may be removably installed without significant modifications to a trailer. In some embodiments, the aid system may include one or more guide straps that are elastic, at least in part, to facilitate the guiding and positioning of a watercraft and/or associated winch hook assembly during launching and/or loading operations. Further embodiments may ease launching operations by providing a certain measure of force propelling the watercraft from the mobile trailer into the water, and/or ease loading operations by positioning the winch hook assembly towards a rear of the mobile trailer during loading operations.