Were you asking how the lights are to be aimed (answered above), or how the adjustment is made?
If the latter, and assuming your coach uses the '98-'02 Chevy Tahoe/Suburban/pickup light assembly, the adjustment screws are found on the inside top (up/down) and outside back (left/right) of each assembly behind the lamp units. The adjust screws are at right angles to the long screws you see pointing to the rear, and you need a T-15 torx driver for the job.
Regarding weak lights, I installed a relay that allows all four lamps, both high and low beam, to be on when on high beam. With the high beams only, I could not see the road up close. Dumb idea, Chevrolet!
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2017 Coachmen Orion, Ford Transit 3.7L: previous
'09 Pleasure Way Lexor, '05 NRV Dolphin 5342
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