we try to use the mirror to see if he has noticed us. slowly pulling up beside the truck starting at the trailer and by the time we get to where we can see him in his mirror he is looking like WTF are they doing and then we see the big smile on his face.
I always try to watch the trucker's mirror to see if they are paying attention as I come alongside. Unfortunately, most drivers are sitting so far back, they don't show in the mirror or the window. Especially since I am also driving, this poses a problem for me. Sigh..... What are they thinking.... I have hundreds of miles to drive each day and sitting comfortably is more important than catching a chance flash???? LOL