I'm a company driver, and I don't even get a crack at the wheelweights off the equipment we use. Everything is subcontracted out to KalTire, so they're the ones with all of our wheelwieghts. I haven't even tried asking the tire techs for weights. Like a lot of people, I get shot down on a regular basis when asking tire shops for their used wheelweights.
Yeah, it was meant as a joke, but some of those weights can be several ounces each in weight.
Was talking to my safety department last week and a while back we had a load stolen at gunpoint in our nations capital.
So, prowling around a truck stop will probably not end well for somebody who is up to no good.
Good luck to the OP on his search for lead