Check for legitimacy in their website by reading what previous customers had to say about the service the company provides, if the company has bad reviews , such as these reviews. If the website does not have a link to customer reviews, consider moving on to the next company. If it seems as though they are attempting to conceal their reputation, they are more than likely a less than reputable company.
Have any questions you have prepared before calling the shipping company. If the agent you are speaking with does not sound knowledgeable about how the process works, you can take that as a sign to search for another company. The best motorcycle shippers will be able to answer all of your questions without hesitation.