Considering buying a truck and leasing out to Fed Ex CC and had a few questions.

What can I expect to pay for a used (4-5 yrs old) class 8 tractor trailer truck and what would be an average (loaded and unloaded) mileage to expect? What would be an average year in maintenance costs? Suggestion on dependable make of truck?

From what I can tell, teams are the way to go. What is a competitive wage?

Thanks in advance!