I know they give tours for part time people, not sure about mechanics. I never went to the Dallas hub. Went to Mesquite a bunch of times in my career though. From what I saw in the hub I worked in, it looks there are 3 kinds of mechanics that I ran across. Package car, tractor and trailers. The noobs almost certainly work nights, at least initially. There wasn't much OT for mechanics here, I guess because they had to give up their stall to the next guy coming on duty. I know their pay is right up there with the top drivers, plus they get an annual tool allowance. There are several mechanics who frequent this forum, judging by their handles, and I'm sure someone will jump in and give you more precise answers to your questions. Good luck to you, sir.