The general rule is that an individual is an independent contractor if you, the person for whom the services are performed, have the right to control or direct only the result of the work and not the means and methods of accomplishing the result.
Doesn't fedex control how drivers perform their job and the appearance of your fleet.Example: Vera Elm, an electrician, submitted a job estimate to a housing complex for electrical work at $16 per hour for 400 hours. She is to receive $1,280 every 2 weeks for the next 10 weeks. This is not considered payment by the hour. Even if she works more or less than 400 hours to complete the work, Vera Elm will receive $6,400. She also performs additional electrical installations under contracts with other companies that she obtained through advertisements. Vera is an independent contractor.
The last sentence is what I meant, You cannot perform additional work for other companies. The above came from irs.gov.
I would check up on that if I were you. I did some moving work for World Relief (non-profit refugee assistance) a couple weeks ago in a Ground approved vehicle. Didn't even have to ask permission.