I believe he's referring to jerry's post, on how a good antenna will do you more than well, as opposed to the guy that can't get out 1/2 a mile due to a crappy antenna so he thinks "more watts will fix that".
Very true. However due to height, most truck drivers cannot run the best antenna for a CB, a 108 inch whip. Therefore they have to run the short little firesticks and such...and there's an old saying of "height is might".
Which is why I believe many truckers run power, because they're trying to make up for short falls of the little firesticks. That or they just want to be 1 up over the next guy who also happens to be running a linear.