i tried moving mine up and down to compare the adjustment but, it was a miniscule amount of hieight control over the entire range. I'd say if you go with the Radio Shack fix or the Stealership, you'll never be flashed by anyone assuming you have high beams because of a loaded trunk. I did notice however that they appeared rediculously low when there was a problem with it. Not sure if that is beyond the normal adjustment heights.