TRUCKING file [ load("TRUCKING.Rdata") names(TRUCKING) attach(TRUCKING)]

Hi there,
I am not an expert of R and honestly spent more time that what I should. I loaded "trucking" file form packages. Though, I need to choose trucking 4 so I can compare 4 carriers. I could not figure it out. I think there is a way to opt through the console screen. I wonder if there anyway to do it?
load("TRUCKING.Rdata")
names(TRUCKING)
attach(TRUCKING)
Thank you very much,
AJ