Kyle Busch's PR team - incidentally, one of the best in Nascar - likes to promote truck series wins as if they add genuine luster to KDB's resume. And some Busch fanboys follow suit because they've got nothing else to crow about.
Here's what I say about that... All wins mean something, but not all wins mean the same thing. Cup races are notoriously hard to win, with a deep field of highly talented and fully resourced teams, designed for extreme parity, not to mention "Oops Factors" like late restarts, 8-second pit stops, G-W-C's, etc etc. Winning a cup races is, by definition, a victory over the very best stock car racers on the planet. Truck races, in contrast, are like high school football, and you know that is the truth.