The “benefit” is that the truck is a rolling weather center and can do ANYTHING (and more) that 3's (or anyone’s for that matter) weather center can do, ANYWHERE at ANYTIME. Exact weather conditions from the field in real time with a direct satellite radar downlink with down to “street level” resolution and precision.
This storm wasn't a big deal. But when the "big deal" does happen, would you rather watch 30 with their reporters standing on a pile of snow with a ruler telling you their "scientific" observations, 3 with Haney and his off-Broadway song and dance show, or 8 with a real time, mobile, weather center with a real meteorologist in the field that 3 and 30 only wished they had.
I don't know about you, but I'll stick with 8.