Alignment Question

Hey everyone,
Got a general question, and figured there would be a couple people that could help me here. I got a 2010 Off Road DC. I had an alignment done on the car approx. 2 months ago. Over that time, I had an extended road trip in which I noticed that car pulling to the left. I have no type of shaking, and I have no type of abnormal tire wear. I am the only one that drives the truck, and I know that I did not hit anything crazy, hell, don't even think that I took the truck off road during that time. Why is my alignment going out?? When I drove it home, it was perfect, and I trust the shop I go to, no problems there... Well, what do you guys think??

 

Could be you have developed a tire pull.
Swap the front tires and see if it pulls the other way or stops the pull.
If your not seeing any strange wear at this point i would start here.
when the truck is off the ground spin the tires to see if there is a big difference in the effort to rotate them.
If everything is the same after then take it back.