Dont use them. Period.
I'm a business owner and ship approx $200-250K per year in combined shipping (parcel, crates, ltl, etc) and have shipped with multiple shippers over the years and these guys are the worst. Stay away.
My scales are certified every 30 days and dead accurate. We always add a few extra pounds to each BOL just to cover bases but we constantly got these double weight overcharges and they take the money out of your account first, then you have to fight for months to get it back even if you have all the proof.
What broke our relationship was a shipment of 2 custom hand made tables worth $12,500 for my client and over the course of a month, lost it. It was only going 300 miles.Its a 2 day delivery tops. I even paid an additional $500 for another truck through them to go pick it up and drive it to my now extremely upset client and they kept that money as well. Took weeks to get a return phone call or email and then it was "well, just wait for our decision in 120 days".
Some of the reps are friendly but its the infrastructure and lack of accountability that makes this company a huge liability for shipping. From one small business owner to another, dont. There are lots of other options.