Thanks for your reply.
I had another look and lo and behold, I found the adjustment wormscrews. I only could find the vertical ones however. The left/right adjusters must be well hidden or I am blind.
Behind each headlight assembly towards the fender, there is a vertical slot that a long handle phillips slides down and the adjuster is at the bottom. It is clearly visible. Turning the screw right or clockwise raises the beam, turning it left or counter-clockwise lowers it. I have them adjusted nicely now.
BTW, it was a very easy process. The headlight beam has a fairly sharp horizontal cutoff pattern. However, the beam pattern doesnt slant up to the right like my Highlander did to catch roadsigns. Instead, the Tundra has a flat beam that does not slope up on the side.