its a simple 1 screw adjustment for up and down for those trucks. Find a place about 20 feet from a wall on flat ground at night, lift the camper with the jacks till the weight is off the bed and use chunks of painter's tape to mark the height of the low beam pattern. lower the camper back on the truck and then crank the lights down till they match the tap while counting the number of turns and writing it down for each side. Then you just need to do that many turns up or down depending on if you are loading or unloading.
Steve