I wouldn't worry too much about it. Mine's been through hell and hell again (don't think its been allowed to come back yet), and it still drives straight as an arrow and doesn't wear out tires. The truck's built pretty well, so unless you're starting to hear new noises then I personally wouldn't worry too much, otherwise having an alignment shop take a look at it wouldn't hurt either.
Its just normal for a truck to make a hard bang noise when you bounce through a hard pothole, there's a lot of weight being shifted around at some pretty hard G's. Your shocks will absorb most of it, but check to see if they're leaking or showing any signs of not moving freely (they'll make it pretty obvious, squeaking or grinding/banging noises as they start to go, and ultimately leaking oil). LR
'09 Ford Ranger FX4 with a mean owner