Here is my story....
Took about a week and a half from start to finish. Applied 3 days before the posting closed, did the standard GAT, (simple if you have common sense and your wits about you). Then got an email a day later saying i was successful, and come for interview 3 days later.
Did interview with the operations manager of trucking operations, but correspondence with a HR employee.
Standard Interview, STAR behaviour based interview along with some "what would you do if you were in this situation". As long as you are able to answer in the STAR format, you should be fine. Relate your answers to their questions etc.
Also there was some chit chat, get to know who you are are and who, what the company is all about.
After that, went home, and that afternoon, was told i was successful, and moved onto security clearance process. Less than a week from the initial interview date, security process was cleared, and i was offered the position. Training starts in a bit.