All you need to drive a commercial truck under 24,000 pounds(wihout airbrakes) is a chauffers license.
As for being a truck driver, I drive a van now, but drove a big truck for about 6 1/2 years before this. The trucking industry just isn't the way it used to be when my father drove one. Now, I make about the same pay, have about a quarter of the overhead, and don't have to deal with the DOT as much. I wish driving a truck was more prosperous, because I did enjoy it. Unfortunately, it isn't, and I would like to be able to retire one day. Now days you are just paying the truck if you buy a big rig. Especially, with the price of fuel the way it is.