Save your money and just go and get your own authority for 300.00. You can do it all on the internet and join OOIDA they will file the process agents for free. The idea of buying a good DOT number are long gone. If the FMCSA transfers an authority, they will issue a new number. No more hiding a terrible past by buying an good number. The MC numbers are a thing of the past. It is all covered by a U S DOT Number.
It takes 2 weeks after you file the insurance with FMCSA to get your authority approved. The morning after filing, your phone will be busy with all sorts of people wanting to do your IRP, IFTA, drug testing consortium etc.