[Theunz]

If I had to choose one over the other I would give preference to bed rail clearance over ride angle of the trailer. If you could get the measurement from the hitch plate of the pin box to the bottom of the overhang and then from the floor of the truck bed to the top of the rails you could determine how high the curt needs to be in order to give you about six inches of bed rail clearance. Someone here with the same pin box could probably supply you with that measurement, or you could go to a RV dealer and measure one.