It seems like after a trip off-road I gotta do an alignment is this normal? It pulls to the left slightly. I have a 13 jkus 3.5" aev ds sc lift and 35"nitro trail grapplers

 

This can happen anytime you go offroad, but it doesn't mean you need an alignment shop. It just means it is time to get acquainted with the underside of your Jeep. There are some great write-ups here about the care and feeding of your front end. Take a look.

The toe-in and steering center get knocked off easily, but they can be set with equal ease using a tape measure and a few wrenches.

If you set the toe and recenter and still pull to one side, then it may take an alignment shop to tell you why, however they can't set anything but the toe and center either. Castor and camber are not adjustable on a stock JK.