Well, you have to be able to read between the lines when you're talking to recruiters. Honestly, they don't know all the ins-and-outs of the business, and their job is to sign you up, so they have a tendancy to elaborate a bit.
I think the most important question to ask a recruiter is . . . What types of customers do you have? (ie, what are you hauling?). If the response is "mostly autoparts", you might be able to surmise that you won't have the 3000 miles a week that they promised, considering the current economic conditions. Having a good understanding of current and emerging markets will help make your decision easier.