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For this reason, the installation of a bed cover is the perfect time to perform a headlight re-aiming check. Park your 2018 Ram on level ground exactly 25 feet from a flat wall with the bed cover installed and any typical cargo you carry. Measure from the ground to the center of each headlight bulb and mark that height on the wall with tape. Using a 7mm socket on an extension, locate the vertical adjustment screw accessible through a hole in the inner fender. Turn the screw to lower the beam so that the top of the low-beam cutoff is approximately 2 to 2.5 inches below the center mark on the wall. This simple adjustment, which takes less than five minutes, ensures that your improved aerodynamics and cargo security do not come at the cost of nighttime safety.